Sync notifications using WorkManager (#5545)

* Initial implementation of notification sync using `WorkManager`

* Use custom `MetroWorkerFactory` to allow assisted injection in WorkManager Workers

* Add tests for `FetchNotificationWorker`. Create `FakeNotificationResolverQueue` to help testing.

* Add more tests, fix Konsist checks

* Add tests for `SyncNotificationWorkManagerRequest`

* Simplify `FakeNotificationResolverQueue`

app/src/main/AndroidManifest.xml

@@ -34,10 +34,17 @@
         <provider
             android:name="androidx.startup.InitializationProvider"
             android:authorities="${applicationId}.androidx-startup"
-            android:exported="false">
+            android:exported="false"
+            tools:node="merge">
             <meta-data
                 android:name='androidx.lifecycle.ProcessLifecycleInitializer'
                 android:value='androidx.startup' />
+
+            <!-- Remove to use Application workManagerConfiguration -->
+            <meta-data
+                android:name="androidx.work.WorkManagerInitializer"
+                android:value="androidx.startup"
+                tools:node="remove" />
         </provider>
 
         <!--
@@ -175,7 +182,6 @@
                 android:name="android.support.FILE_PROVIDER_PATHS"
                 android:resource="@xml/file_providers" />
         </provider>
-
     </application>
 
 </manifest>

app/src/main/kotlin/io/element/android/x/ElementXApplication.kt

@@ -9,17 +9,23 @@ package io.element.android.x
 
 import android.app.Application
 import androidx.startup.AppInitializer
+import androidx.work.Configuration
 import dev.zacsweers.metro.createGraphFactory
 import io.element.android.features.cachecleaner.api.CacheCleanerInitializer
 import io.element.android.libraries.di.DependencyInjectionGraphOwner
+import io.element.android.libraries.workmanager.api.di.MetroWorkerFactory
 import io.element.android.x.di.AppGraph
 import io.element.android.x.info.logApplicationInfo
 import io.element.android.x.initializer.CrashInitializer
 import io.element.android.x.initializer.PlatformInitializer
 
-class ElementXApplication : Application(), DependencyInjectionGraphOwner {
+class ElementXApplication : Application(), DependencyInjectionGraphOwner, Configuration.Provider {
     override val graph: AppGraph = createGraphFactory<AppGraph.Factory>().create(this)
 
+    override val workManagerConfiguration: Configuration = Configuration.Builder()
+            .setWorkerFactory(MetroWorkerFactory(graph.workerProviders))
+            .build()
+
     override fun onCreate() {
         super.onCreate()
         AppInitializer.getInstance(this).apply {
@@ -27,6 +33,7 @@ class ElementXApplication : Application(), DependencyInjectionGraphOwner {
             initializeComponent(PlatformInitializer::class.java)
             initializeComponent(CacheCleanerInitializer::class.java)
         }
+
         logApplicationInfo(this)
     }
 }

app/src/main/kotlin/io/element/android/x/di/AppGraph.kt

@@ -8,16 +8,24 @@
 package io.element.android.x.di
 
 import android.content.Context
+import androidx.work.ListenableWorker
 import dev.zacsweers.metro.AppScope
 import dev.zacsweers.metro.DependencyGraph
+import dev.zacsweers.metro.Multibinds
 import dev.zacsweers.metro.Provides
 import io.element.android.libraries.architecture.NodeFactoriesBindings
 import io.element.android.libraries.di.annotations.ApplicationContext
+import io.element.android.libraries.workmanager.api.di.MetroWorkerFactory
+import kotlin.reflect.KClass
 
 @DependencyGraph(AppScope::class)
 interface AppGraph : NodeFactoriesBindings {
     val sessionGraphFactory: SessionGraph.Factory
 
+    @Multibinds
+    val workerProviders:
+        Map<KClass<out ListenableWorker>, MetroWorkerFactory.WorkerInstanceFactory<*>>
+
     @DependencyGraph.Factory
     interface Factory {
         fun create(

features/logout/impl/build.gradle.kts

@@ -34,10 +34,12 @@ dependencies {
     implementation(projects.libraries.testtags)
     implementation(projects.libraries.uiStrings)
     implementation(projects.libraries.dateformatter.api)
+    implementation(projects.libraries.workmanager.api)
     api(projects.features.logout.api)
 
     testCommonDependencies(libs, true)
     testImplementation(projects.libraries.matrix.test)
     testImplementation(projects.libraries.featureflag.test)
     testImplementation(projects.libraries.sessionStorage.test)
+    testImplementation(projects.libraries.workmanager.test)
 }

features/logout/impl/src/main/kotlin/io/element/android/features/logout/impl/LogoutPresenter.kt

@@ -26,6 +26,7 @@ import io.element.android.libraries.matrix.api.MatrixClient
 import io.element.android.libraries.matrix.api.encryption.BackupState
 import io.element.android.libraries.matrix.api.encryption.BackupUploadState
 import io.element.android.libraries.matrix.api.encryption.EncryptionService
+import io.element.android.libraries.workmanager.api.WorkManagerScheduler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -34,6 +35,7 @@ import kotlinx.coroutines.launch
 class LogoutPresenter(
     private val matrixClient: MatrixClient,
     private val encryptionService: EncryptionService,
+    private val workManagerScheduler: WorkManagerScheduler,
 ) : Presenter<LogoutState> {
     @Composable
     override fun present(): LogoutState {
@@ -109,6 +111,9 @@ class LogoutPresenter(
         ignoreSdkError: Boolean,
     ) = launch {
         suspend {
+            // Cancel any pending work (e.g. notification sync)
+            workManagerScheduler.cancel(matrixClient.sessionId)
+
             matrixClient.logout(userInitiated = true, ignoreSdkError)
         }.runCatchingUpdatingState(logoutAction)
     }

features/logout/impl/src/test/kotlin/io/element/android/features/logout/impl/LogoutPresenterTest.kt

@@ -14,6 +14,7 @@ import app.cash.turbine.test
 import com.google.common.truth.Truth.assertThat
 import io.element.android.libraries.architecture.AsyncAction
 import io.element.android.libraries.matrix.api.MatrixClient
+import io.element.android.libraries.matrix.api.core.SessionId
 import io.element.android.libraries.matrix.api.encryption.BackupState
 import io.element.android.libraries.matrix.api.encryption.BackupUploadState
 import io.element.android.libraries.matrix.api.encryption.EncryptionService
@@ -21,7 +22,9 @@ import io.element.android.libraries.matrix.api.encryption.RecoveryState
 import io.element.android.libraries.matrix.test.AN_EXCEPTION
 import io.element.android.libraries.matrix.test.FakeMatrixClient
 import io.element.android.libraries.matrix.test.encryption.FakeEncryptionService
+import io.element.android.libraries.workmanager.test.FakeWorkManagerScheduler
 import io.element.android.tests.testutils.WarmUpRule
+import io.element.android.tests.testutils.lambda.lambdaRecorder
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.test.runTest
@@ -145,7 +148,9 @@ class LogoutPresenterTest {
 
     @Test
     fun `present - logout then confirm`() = runTest {
-        val presenter = createLogoutPresenter()
+        val cancelWorkManagerJobsLambda = lambdaRecorder<SessionId, Unit> {}
+        val workManagerScheduler = FakeWorkManagerScheduler(cancelLambda = cancelWorkManagerJobsLambda)
+        val presenter = createLogoutPresenter(workManagerScheduler = workManagerScheduler)
         moleculeFlow(RecompositionMode.Immediate) {
             presenter.present()
         }.test {
@@ -158,6 +163,8 @@ class LogoutPresenterTest {
             assertThat(loadingState.logoutAction).isInstanceOf(AsyncAction.Loading::class.java)
             val successState = awaitItem()
             assertThat(successState.logoutAction).isInstanceOf(AsyncAction.Success::class.java)
+
+            cancelWorkManagerJobsLambda.assertions().isCalledOnce()
         }
     }
 
@@ -230,7 +237,9 @@ class LogoutPresenterTest {
 internal fun createLogoutPresenter(
     matrixClient: MatrixClient = FakeMatrixClient(),
     encryptionService: EncryptionService = FakeEncryptionService(),
+    workManagerScheduler: FakeWorkManagerScheduler = FakeWorkManagerScheduler(cancelLambda = {}),
 ): LogoutPresenter = LogoutPresenter(
     matrixClient = matrixClient,
     encryptionService = encryptionService,
+    workManagerScheduler = workManagerScheduler,
 )

features/rageshake/impl/src/test/kotlin/io/element/android/features/rageshake/impl/reporter/DefaultBugReporterTest.kt

@@ -163,7 +163,7 @@ class DefaultBugReporterTest {
         assertThat(foundValues["file"]).contains(fakePushRules)
 
         // device_key now added given they are not null
-        // so is the push_rules value
+        // so is the file value for the included push_rules
         assertThat(progressValues.size).isEqualTo(EXPECTED_NUMBER_OF_PROGRESS_VALUE + 2)
 
         server.shutdown()

gradle/libs.versions.toml

@@ -20,6 +20,7 @@ lifecycle = "2.9.2"
 activity = "1.11.0"
 media3 = "1.8.0"
 camera = "1.5.1"
+work = "2.10.5"
 
 # Compose
 compose_bom = "2025.07.00"
@@ -94,6 +95,7 @@ androidx_camera_lifecycle = { module = "androidx.camera:camera-lifecycle", versi
 androidx_camera_view = { module = "androidx.camera:camera-view", version.ref = "camera" }
 androidx_camera_camera2 = { module = "androidx.camera:camera-camera2", version.ref = "camera" }
 androidx_javascriptengine = "androidx.javascriptengine:javascriptengine:1.0.0"
+androidx_workmanager_runtime = { module = "androidx.work:work-runtime-ktx", version.ref = "work" }
 
 androidx_recyclerview = "androidx.recyclerview:recyclerview:1.4.0"
 androidx_browser = "androidx.browser:browser:1.9.0"

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -109,4 +109,12 @@ enum class FeatureFlags(
         defaultValue = { false },
         isFinished = false,
     ),
+    SyncNotificationsWithWorkManager(
+        key = "feature.sync_notifications_with_workmanager",
+        title = "Sync notifications with WorkManager",
+        description = "Use WorkManager to schedule notification sync tasks when a push is received." +
+            " This should improve reliability and battery usage.",
+        defaultValue = { false },
+        isFinished = false,
+    ),
 }

libraries/push/api/src/main/kotlin/io/element/android/libraries/push/api/push/NotificationEventRequest.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.api.push
+
+import io.element.android.libraries.matrix.api.core.EventId
+import io.element.android.libraries.matrix.api.core.RoomId
+import io.element.android.libraries.matrix.api.core.SessionId
+
+data class NotificationEventRequest(
+    val sessionId: SessionId,
+    val roomId: RoomId,
+    val eventId: EventId,
+    val providerInfo: String,
+)

libraries/push/api/src/main/kotlin/io/element/android/libraries/push/api/push/SyncOnNotifiableEvent.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.api.push
+
+fun interface SyncOnNotifiableEvent {
+    suspend operator fun invoke(requests: List<NotificationEventRequest>)
+}

libraries/push/impl/build.gradle.kts

@@ -49,10 +49,12 @@ dependencies {
     implementation(projects.libraries.network)
     implementation(projects.libraries.matrix.api)
     implementation(projects.libraries.matrixui)
+    implementation(projects.features.networkmonitor.api)
     implementation(projects.libraries.preferences.api)
     implementation(projects.libraries.sessionStorage.api)
     implementation(projects.libraries.uiStrings)
     implementation(projects.libraries.troubleshoot.api)
+    implementation(projects.libraries.workmanager.api)
     implementation(projects.features.call.api)
     implementation(projects.features.lockscreen.api)
     implementation(projects.libraries.featureflag.api)
@@ -73,8 +75,10 @@ dependencies {
     testImplementation(projects.libraries.pushproviders.test)
     testImplementation(projects.libraries.pushstore.test)
     testImplementation(projects.libraries.troubleshoot.test)
+    testImplementation(projects.libraries.workmanager.test)
     testImplementation(projects.features.call.test)
     testImplementation(projects.features.lockscreen.test)
+    testImplementation(projects.features.networkmonitor.test)
     testImplementation(projects.services.appnavstate.test)
     testImplementation(projects.services.toolbox.impl)
     testImplementation(projects.services.toolbox.test)

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/notifications/DefaultNotifiableEventResolver.kt

@@ -44,6 +44,7 @@ import io.element.android.libraries.matrix.api.timeline.item.event.TextMessageTy
 import io.element.android.libraries.matrix.api.timeline.item.event.VideoMessageType
 import io.element.android.libraries.matrix.api.timeline.item.event.VoiceMessageType
 import io.element.android.libraries.matrix.ui.messages.toPlainText
+import io.element.android.libraries.push.api.push.NotificationEventRequest
 import io.element.android.libraries.push.impl.R
 import io.element.android.libraries.push.impl.notifications.model.InviteNotifiableEvent
 import io.element.android.libraries.push.impl.notifications.model.NotifiableMessageEvent
@@ -95,7 +96,10 @@ class DefaultNotifiableEventResolver(
         val client = matrixClientProvider.getOrRestore(sessionId).getOrElse {
             return Result.failure(IllegalStateException("Couldn't get or restore client for session $sessionId"))
         }
-        val ids = notificationEventRequests.groupBy { it.roomId }.mapValues { (_, value) -> value.map { it.eventId } }
+        val ids = notificationEventRequests.groupBy { it.roomId }
+            .mapValues { (_, requests) ->
+                requests.map { it.eventId }
+            }
 
         // TODO this notificationData is not always valid at the moment, sometimes the Rust SDK can't fetch the matching event
         val notificationsResult = client.notificationService.getNotifications(ids)

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/notifications/NotificationResolverQueue.kt

@@ -8,13 +8,16 @@
 package io.element.android.libraries.push.impl.notifications
 
 import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.ContributesBinding
 import dev.zacsweers.metro.Inject
 import dev.zacsweers.metro.SingleIn
 import io.element.android.libraries.di.annotations.AppCoroutineScope
-import io.element.android.libraries.matrix.api.core.EventId
+import io.element.android.libraries.featureflag.api.FeatureFlagService
-import io.element.android.libraries.matrix.api.core.RoomId
+import io.element.android.libraries.featureflag.api.FeatureFlags
-import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.push.api.push.NotificationEventRequest
 import io.element.android.libraries.push.impl.notifications.model.ResolvedPushEvent
+import io.element.android.libraries.push.impl.workmanager.SyncNotificationWorkManagerRequest
+import io.element.android.libraries.workmanager.api.WorkManagerScheduler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
@@ -27,18 +30,26 @@ import kotlinx.coroutines.launch
 import timber.log.Timber
 import kotlin.time.Duration.Companion.milliseconds
 
+interface NotificationResolverQueue {
+    val results: SharedFlow<Pair<List<NotificationEventRequest>, Map<NotificationEventRequest, Result<ResolvedPushEvent>>>>
+    suspend fun enqueue(request: NotificationEventRequest)
+}
+
 /**
  * This class is responsible for periodically batching notification requests and resolving them in a single call,
  * so that we can avoid having to resolve each notification individually in the SDK.
  */
 @OptIn(ExperimentalCoroutinesApi::class)
 @SingleIn(AppScope::class)
+@ContributesBinding(AppScope::class)
 @Inject
-class NotificationResolverQueue(
+class DefaultNotificationResolverQueue(
     private val notifiableEventResolver: NotifiableEventResolver,
     @AppCoroutineScope
     private val appCoroutineScope: CoroutineScope,
-) {
+    private val workManagerScheduler: WorkManagerScheduler,
+    private val featureFlagService: FeatureFlagService,
+) : NotificationResolverQueue {
     companion object {
         private const val BATCH_WINDOW_MS = 250L
     }
@@ -50,7 +61,7 @@ class NotificationResolverQueue(
      * A flow that emits pairs of a list of notification event requests and a map of the resolved events.
      * The map contains the original request as the key and the resolved event as the value.
      */
-    val results: SharedFlow<Pair<List<NotificationEventRequest>, Map<NotificationEventRequest, Result<ResolvedPushEvent>>>> = MutableSharedFlow()
+    override val results = MutableSharedFlow<Pair<List<NotificationEventRequest>, Map<NotificationEventRequest, Result<ResolvedPushEvent>>>>()
 
     /**
      * Enqueues a notification event request to be resolved.
@@ -58,7 +69,7 @@ class NotificationResolverQueue(
      *
      * @param request The notification event request to enqueue.
      */
-    suspend fun enqueue(request: NotificationEventRequest) {
+    override suspend fun enqueue(request: NotificationEventRequest) {
         // Cancel previous processing job if it exists, acting as a debounce operation
         Timber.d("Cancelling job: $currentProcessingJob")
         currentProcessingJob?.cancel()
@@ -77,28 +88,27 @@ class NotificationResolverQueue(
         appCoroutineScope.launch {
             val groupedRequestsById = buildList {
                 while (!requestQueue.isEmpty) {
-                    requestQueue.receiveCatching().getOrNull()?.let(this::add)
+                    requestQueue.receiveCatching().getOrNull()?.let(::add)
                 }
             }.groupBy { it.sessionId }
 
-            val sessionIds = groupedRequestsById.keys
+            if (featureFlagService.isFeatureEnabled(FeatureFlags.SyncNotificationsWithWorkManager)) {
-            for (sessionId in sessionIds) {
+                for ((sessionId, requests) in groupedRequestsById) {
-                val requests = groupedRequestsById[sessionId].orEmpty()
+                    workManagerScheduler.submit(SyncNotificationWorkManagerRequest(sessionId, requests))
-                Timber.d("Fetching notifications for $sessionId: $requests. Pending requests: ${!requestQueue.isEmpty}")
+                }
-                // Resolving the events in parallel should improve performance since each session id will query a different Client
+            } else {
-                launch {
+                val sessionIds = groupedRequestsById.keys
-                    // No need for a Mutex since the SDK already has one internally
+                for (sessionId in sessionIds) {
-                    val notifications = notifiableEventResolver.resolveEvents(sessionId, requests).getOrNull().orEmpty()
+                    val requests = groupedRequestsById[sessionId].orEmpty()
-                    (results as MutableSharedFlow).emit(requests to notifications)
+                    Timber.d("Fetching notifications for $sessionId: $requests. Pending requests: ${!requestQueue.isEmpty}")
+                    // Resolving the events in parallel should improve performance since each session id will query a different Client
+                    launch {
+                        // No need for a Mutex since the SDK already has one internally
+                        val notifications = notifiableEventResolver.resolveEvents(sessionId, requests).getOrNull().orEmpty()
+                        results.emit(requests to notifications)
+                    }
                 }
             }
         }
     }
 }
-
-data class NotificationEventRequest(
-    val sessionId: SessionId,
-    val roomId: RoomId,
-    val eventId: EventId,
-    val providerInfo: String,
-)

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/push/DefaultPushHandler.kt

@@ -16,7 +16,11 @@ import io.element.android.features.call.api.ElementCallEntryPoint
 import io.element.android.libraries.core.log.logger.LoggerTag
 import io.element.android.libraries.core.meta.BuildMeta
 import io.element.android.libraries.di.annotations.AppCoroutineScope
+import io.element.android.libraries.featureflag.api.FeatureFlagService
+import io.element.android.libraries.featureflag.api.FeatureFlags
 import io.element.android.libraries.matrix.api.exception.NotificationResolverException
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+import io.element.android.libraries.push.api.push.SyncOnNotifiableEvent
 import io.element.android.libraries.push.impl.history.PushHistoryService
 import io.element.android.libraries.push.impl.history.onDiagnosticPush
 import io.element.android.libraries.push.impl.history.onInvalidPushReceived
@@ -24,7 +28,6 @@ import io.element.android.libraries.push.impl.history.onSuccess
 import io.element.android.libraries.push.impl.history.onUnableToResolveEvent
 import io.element.android.libraries.push.impl.history.onUnableToRetrieveSession
 import io.element.android.libraries.push.impl.notifications.FallbackNotificationFactory
-import io.element.android.libraries.push.impl.notifications.NotificationEventRequest
 import io.element.android.libraries.push.impl.notifications.NotificationResolverQueue
 import io.element.android.libraries.push.impl.notifications.channels.NotificationChannels
 import io.element.android.libraries.push.impl.notifications.model.FallbackNotifiableEvent
@@ -65,6 +68,8 @@ class DefaultPushHandler(
     @AppCoroutineScope
     private val appCoroutineScope: CoroutineScope,
     private val fallbackNotificationFactory: FallbackNotificationFactory,
+    private val syncOnNotifiableEvent: SyncOnNotifiableEvent,
+    private val featureFlagService: FeatureFlagService,
 ) : PushHandler {
     init {
         processPushEventResults()
@@ -196,6 +201,10 @@ class DefaultPushHandler(
                 if (nonRingingCallEvents.isNotEmpty()) {
                     onNotifiableEventReceived.onNotifiableEventsReceived(nonRingingCallEvents)
                 }
+
+                if (!featureFlagService.isFeatureEnabled(FeatureFlags.SyncNotificationsWithWorkManager)) {
+                    syncOnNotifiableEvent(requests)
+                }
             }
             .launchIn(appCoroutineScope)
     }

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/push/DefaultSyncOnNotifiableEvent.kt

@@ -7,41 +7,45 @@
 
 package io.element.android.libraries.push.impl.push
 
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.ContributesBinding
 import dev.zacsweers.metro.Inject
 import io.element.android.libraries.core.coroutine.CoroutineDispatchers
 import io.element.android.libraries.featureflag.api.FeatureFlagService
 import io.element.android.libraries.featureflag.api.FeatureFlags
 import io.element.android.libraries.matrix.api.MatrixClientProvider
-import io.element.android.libraries.push.impl.notifications.model.NotifiableEvent
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+import io.element.android.libraries.push.api.push.SyncOnNotifiableEvent
 import io.element.android.services.appnavstate.api.AppForegroundStateService
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
 import timber.log.Timber
 import kotlin.time.Duration.Companion.seconds
 
+@ContributesBinding(AppScope::class)
 @Inject
-class SyncOnNotifiableEvent(
+class DefaultSyncOnNotifiableEvent(
     private val matrixClientProvider: MatrixClientProvider,
     private val featureFlagService: FeatureFlagService,
     private val appForegroundStateService: AppForegroundStateService,
     private val dispatchers: CoroutineDispatchers,
-) {
+) : SyncOnNotifiableEvent {
-    suspend operator fun invoke(notifiableEvents: List<NotifiableEvent>) = withContext(dispatchers.io) {
+    override suspend operator fun invoke(requests: List<NotificationEventRequest>) = withContext(dispatchers.io) {
         if (!featureFlagService.isFeatureEnabled(FeatureFlags.SyncOnPush)) {
             return@withContext
         }
 
         try {
-            val eventsBySession = notifiableEvents.groupBy { it.sessionId }
+            val eventsBySession = requests.groupBy { it.sessionId }
 
             appForegroundStateService.updateIsSyncingNotificationEvent(true)
             Timber.d("Starting opportunistic room list sync | In foreground: ${appForegroundStateService.isInForeground.value}")
 
             for ((sessionId, events) in eventsBySession) {
                 val client = matrixClientProvider.getOrRestore(sessionId).getOrNull() ?: continue
-                val eventsByRoomId = events.groupBy { it.roomId }
+                val roomIds = events.map { it.roomId }.distinct()
 
-                client.roomListService.subscribeToVisibleRooms(eventsByRoomId.keys.toList())
+                client.roomListService.subscribeToVisibleRooms(roomIds)
 
                 if (!appForegroundStateService.isInForeground.value) {
                     // Give the sync some time to complete in background

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/push/OnNotifiableEventReceived.kt

@@ -27,11 +27,9 @@ class DefaultOnNotifiableEventReceived(
     private val defaultNotificationDrawerManager: DefaultNotificationDrawerManager,
     @AppCoroutineScope
     private val coroutineScope: CoroutineScope,
-    private val syncOnNotifiableEvent: SyncOnNotifiableEvent,
 ) : OnNotifiableEventReceived {
     override fun onNotifiableEventsReceived(notifiableEvents: List<NotifiableEvent>) {
         coroutineScope.launch {
-            launch { syncOnNotifiableEvent(notifiableEvents) }
             defaultNotificationDrawerManager.onNotifiableEventsReceived(notifiableEvents.filter { it !is NotifiableRingingCallEvent })
         }
     }

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/workmanager/FetchNotificationsWorker.kt

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.impl.workmanager
+
+import android.content.Context
+import androidx.work.CoroutineWorker
+import androidx.work.WorkerParameters
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.Assisted
+import dev.zacsweers.metro.AssistedFactory
+import dev.zacsweers.metro.AssistedInject
+import dev.zacsweers.metro.ContributesIntoMap
+import dev.zacsweers.metro.binding
+import io.element.android.features.networkmonitor.api.NetworkMonitor
+import io.element.android.features.networkmonitor.api.NetworkStatus
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.core.extensions.runCatchingExceptions
+import io.element.android.libraries.di.annotations.ApplicationContext
+import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+import io.element.android.libraries.push.api.push.SyncOnNotifiableEvent
+import io.element.android.libraries.push.impl.notifications.NotifiableEventResolver
+import io.element.android.libraries.push.impl.notifications.NotificationResolverQueue
+import io.element.android.libraries.workmanager.api.WorkManagerScheduler
+import io.element.android.libraries.workmanager.api.di.MetroWorkerFactory
+import io.element.android.libraries.workmanager.api.di.WorkerKey
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.withTimeoutOrNull
+import kotlinx.serialization.json.Json
+import timber.log.Timber
+import kotlin.time.Duration.Companion.seconds
+
+@AssistedInject
+class FetchNotificationsWorker(
+    @Assisted workerParams: WorkerParameters,
+    @ApplicationContext context: Context,
+    private val networkMonitor: NetworkMonitor,
+    private val eventResolver: NotifiableEventResolver,
+    private val queue: NotificationResolverQueue,
+    private val workManagerScheduler: WorkManagerScheduler,
+    private val syncOnNotifiableEvent: SyncOnNotifiableEvent,
+    private val coroutineDispatchers: CoroutineDispatchers,
+    private val json: Json,
+) : CoroutineWorker(context, workerParams) {
+    override suspend fun doWork(): Result = withContext(coroutineDispatchers.io) {
+        Timber.d("FetchNotificationsWorker started")
+        val rawRequestsJson = inputData.getString("requests") ?: return@withContext Result.failure()
+        val requests = runCatchingExceptions {
+            json.decodeFromString<List<SyncNotificationWorkManagerRequest.Data>>(rawRequestsJson).map { it.toRequest() }
+        }.getOrElse {
+            Timber.e(it, "Failed to deserialize notification requests")
+            return@withContext Result.failure()
+        }
+
+        Timber.d("Deserialized ${requests.size} requests")
+
+        // Wait for network to be available, but not more than 10 seconds
+        val hasNetwork = withTimeoutOrNull(10.seconds) {
+            networkMonitor.connectivity.first { it == NetworkStatus.Connected }
+        } != null
+        if (!hasNetwork) {
+            Timber.w("No network, retrying later")
+            return@withContext Result.retry()
+        }
+
+        val failedSyncForSessions = mutableSetOf<SessionId>()
+
+        val groupedRequests = requests.groupBy { it.sessionId }
+        for ((sessionId, notificationRequests) in groupedRequests) {
+            Timber.d("Processing notification requests for session $sessionId")
+            eventResolver.resolveEvents(sessionId, notificationRequests)
+                .fold(
+                    onSuccess = { result ->
+                        // Update the resolved results in the queue
+                        (queue.results as MutableSharedFlow).emit(requests to result)
+                    },
+                    onFailure = {
+                        failedSyncForSessions += sessionId
+                        Timber.e(it, "Failed to resolve notification events for session $sessionId")
+                    }
+                )
+        }
+
+        // If there were failures for whole sessions, we retry all their requests
+        if (failedSyncForSessions.isNotEmpty()) {
+            for (failedSessionId in failedSyncForSessions) {
+                val requestsToRetry = groupedRequests[failedSessionId] ?: continue
+                Timber.d("Re-scheduling ${requestsToRetry.size} failed notification requests for session $failedSessionId")
+                workManagerScheduler.submit(SyncNotificationWorkManagerRequest(failedSessionId, requestsToRetry))
+            }
+        }
+
+        Timber.d("Notifications processed successfully")
+
+        performOpportunisticSyncIfNeeded(groupedRequests)
+
+        Result.success()
+    }
+
+    private suspend fun performOpportunisticSyncIfNeeded(
+        groupedRequests: Map<SessionId, List<NotificationEventRequest>>,
+    ) {
+        for ((sessionId, notificationRequests) in groupedRequests) {
+            runCatchingExceptions {
+                syncOnNotifiableEvent(notificationRequests)
+            }.onFailure {
+                Timber.e(it, "Failed to sync on notifiable events for session $sessionId")
+            }
+        }
+    }
+
+    @ContributesIntoMap(AppScope::class, binding = binding<MetroWorkerFactory.WorkerInstanceFactory<*>>())
+    @WorkerKey(FetchNotificationsWorker::class)
+    @AssistedFactory
+    abstract class Factory : MetroWorkerFactory.WorkerInstanceFactory<FetchNotificationsWorker>
+}

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/workmanager/SyncNotificationWorkManagerRequest.kt

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.impl.workmanager
+
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.OutOfQuotaPolicy
+import androidx.work.WorkRequest
+import androidx.work.workDataOf
+import io.element.android.libraries.core.extensions.runCatchingExceptions
+import io.element.android.libraries.matrix.api.core.EventId
+import io.element.android.libraries.matrix.api.core.RoomId
+import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+import io.element.android.libraries.workmanager.api.WorkManagerRequest
+import io.element.android.libraries.workmanager.api.WorkManagerRequestType
+import io.element.android.libraries.workmanager.api.workManagerTag
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import timber.log.Timber
+import java.security.InvalidParameterException
+
+class SyncNotificationWorkManagerRequest(
+    private val sessionId: SessionId,
+    private val notificationEventRequests: List<NotificationEventRequest>,
+) : WorkManagerRequest {
+    private val json = Json { ignoreUnknownKeys = true }
+
+    override fun build(): Result<WorkRequest> {
+        if (notificationEventRequests.isEmpty()) {
+            return Result.failure(InvalidParameterException("notificationEventRequests cannot be empty"))
+        }
+
+        val json = runCatchingExceptions { json.encodeToString(notificationEventRequests.map { it.toData() }) }
+            .getOrElse {
+                Timber.e(it, "Failed to serialize notification requests")
+                return Result.failure(it)
+            }
+
+        Timber.d("Scheduling ${notificationEventRequests.size} notification requests with WorkManager for $sessionId")
+
+        return Result.success(
+            OneTimeWorkRequestBuilder<FetchNotificationsWorker>()
+                .setInputData(workDataOf("requests" to json))
+                .setExpedited(OutOfQuotaPolicy.RUN_AS_NON_EXPEDITED_WORK_REQUEST)
+                .setTraceTag(workManagerTag(sessionId, WorkManagerRequestType.NOTIFICATION_SYNC))
+                // TODO investigate using this instead of the resolver queue
+    //            .setInputMerger()
+                .build()
+        )
+    }
+
+    @Serializable
+    data class Data(
+        @SerialName("session_id")
+        val sessionId: String,
+        @SerialName("room_id")
+        val roomId: String,
+        @SerialName("event_id")
+        val eventId: String,
+        @SerialName("provider_info")
+        val providerInfo: String,
+    ) {
+        fun toRequest(): NotificationEventRequest {
+            return NotificationEventRequest(
+                sessionId = SessionId(sessionId),
+                roomId = RoomId(roomId),
+                eventId = EventId(eventId),
+                providerInfo = providerInfo,
+            )
+        }
+    }
+}
+
+private fun NotificationEventRequest.toData(): SyncNotificationWorkManagerRequest.Data {
+    return SyncNotificationWorkManagerRequest.Data(
+        sessionId = sessionId.value,
+        roomId = roomId.value,
+        eventId = eventId.value,
+        providerInfo = providerInfo,
+    )
+}

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/notifications/DefaultNotifiableEventResolverTest.kt

@@ -44,6 +44,7 @@ import io.element.android.libraries.matrix.test.FakeMatrixClientProvider
 import io.element.android.libraries.matrix.test.notification.FakeNotificationService
 import io.element.android.libraries.matrix.test.notification.aNotificationData
 import io.element.android.libraries.matrix.test.permalink.FakePermalinkParser
+import io.element.android.libraries.push.api.push.NotificationEventRequest
 import io.element.android.libraries.push.impl.notifications.fake.FakeNotificationMediaRepo
 import io.element.android.libraries.push.impl.notifications.fixtures.aNotifiableMessageEvent
 import io.element.android.libraries.push.impl.notifications.model.FallbackNotifiableEvent

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/notifications/FakeNotifiableEventResolver.kt

@@ -8,6 +8,7 @@
 package io.element.android.libraries.push.impl.notifications
 
 import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.push.api.push.NotificationEventRequest
 import io.element.android.libraries.push.impl.notifications.model.ResolvedPushEvent
 import io.element.android.tests.testutils.lambda.lambdaError
 

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/notifications/fixtures/NotificationEventRequestFixture.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.impl.notifications.fixtures
+
+import io.element.android.libraries.matrix.api.core.EventId
+import io.element.android.libraries.matrix.api.core.RoomId
+import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.matrix.test.AN_EVENT_ID
+import io.element.android.libraries.matrix.test.A_ROOM_ID
+import io.element.android.libraries.matrix.test.A_SESSION_ID
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+
+fun aNotificationEventRequest(
+    sessionId: SessionId = A_SESSION_ID,
+    roomId: RoomId = A_ROOM_ID,
+    eventId: EventId = AN_EVENT_ID,
+    providerInfo: String = "providerInfo",
+) = NotificationEventRequest(
+    sessionId = sessionId,
+    roomId = roomId,
+    eventId = eventId,
+    providerInfo = providerInfo,
+)

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/push/DefaultPushHandlerTest.kt

@@ -14,6 +14,8 @@ import com.google.common.truth.Truth.assertThat
 import io.element.android.features.call.api.CallType
 import io.element.android.features.call.test.FakeElementCallEntryPoint
 import io.element.android.libraries.core.meta.BuildMeta
+import io.element.android.libraries.featureflag.api.FeatureFlags
+import io.element.android.libraries.featureflag.test.FakeFeatureFlagService
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.core.SessionId
@@ -28,12 +30,13 @@ import io.element.android.libraries.matrix.test.A_SECRET
 import io.element.android.libraries.matrix.test.A_SESSION_ID
 import io.element.android.libraries.matrix.test.A_USER_ID
 import io.element.android.libraries.matrix.test.core.aBuildMeta
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+import io.element.android.libraries.push.api.push.SyncOnNotifiableEvent
 import io.element.android.libraries.push.impl.history.FakePushHistoryService
 import io.element.android.libraries.push.impl.history.PushHistoryService
+import io.element.android.libraries.push.impl.notifications.DefaultNotificationResolverQueue
 import io.element.android.libraries.push.impl.notifications.FakeNotifiableEventResolver
 import io.element.android.libraries.push.impl.notifications.FallbackNotificationFactory
-import io.element.android.libraries.push.impl.notifications.NotificationEventRequest
-import io.element.android.libraries.push.impl.notifications.NotificationResolverQueue
 import io.element.android.libraries.push.impl.notifications.channels.FakeNotificationChannels
 import io.element.android.libraries.push.impl.notifications.fixtures.aNotifiableCallEvent
 import io.element.android.libraries.push.impl.notifications.fixtures.aNotifiableMessageEvent
@@ -48,6 +51,8 @@ import io.element.android.libraries.pushstore.api.clientsecret.PushClientSecret
 import io.element.android.libraries.pushstore.test.userpushstore.FakeUserPushStore
 import io.element.android.libraries.pushstore.test.userpushstore.FakeUserPushStoreFactory
 import io.element.android.libraries.pushstore.test.userpushstore.clientsecret.FakePushClientSecret
+import io.element.android.libraries.workmanager.api.WorkManagerRequest
+import io.element.android.libraries.workmanager.test.FakeWorkManagerScheduler
 import io.element.android.services.toolbox.test.strings.FakeStringProvider
 import io.element.android.services.toolbox.test.systemclock.FakeSystemClock
 import io.element.android.tests.testutils.lambda.any
@@ -131,6 +136,45 @@ class DefaultPushHandlerTest {
             .isCalledOnce()
     }
 
+    @Test
+    fun `when classical PushData is received and the workmanager flag is enabled, the work is scheduled`() = runTest {
+        val aNotifiableMessageEvent = aNotifiableMessageEvent()
+        val notifiableEventResult =
+            lambdaRecorder<SessionId, List<NotificationEventRequest>, Result<Map<NotificationEventRequest, Result<ResolvedPushEvent>>>> { _, _ ->
+                val request = NotificationEventRequest(A_SESSION_ID, A_ROOM_ID, AN_EVENT_ID, A_PUSHER_INFO)
+                Result.success(mapOf(request to Result.success(ResolvedPushEvent.Event(aNotifiableMessageEvent))))
+            }
+        val incrementPushCounterResult = lambdaRecorder<Unit> {}
+        val aPushData = PushData(
+            eventId = AN_EVENT_ID,
+            roomId = A_ROOM_ID,
+            unread = 0,
+            clientSecret = A_SECRET,
+        )
+
+        val featureFlagService = FakeFeatureFlagService(mapOf(FeatureFlags.SyncNotificationsWithWorkManager.key to true))
+        val submitWorkLambda = lambdaRecorder<WorkManagerRequest, Unit> {}
+        val workManagerScheduler = FakeWorkManagerScheduler(submitLambda = submitWorkLambda)
+
+        val defaultPushHandler = createDefaultPushHandler(
+            notifiableEventsResult = notifiableEventResult,
+            pushClientSecret = FakePushClientSecret(
+                getUserIdFromSecretResult = { A_USER_ID }
+            ),
+            incrementPushCounterResult = incrementPushCounterResult,
+            featureFlagService = featureFlagService,
+            workManagerScheduler = workManagerScheduler,
+        )
+        defaultPushHandler.handle(aPushData, A_PUSHER_INFO)
+
+        advanceTimeBy(300.milliseconds)
+
+        submitWorkLambda.assertions().isCalledOnce()
+
+        incrementPushCounterResult.assertions()
+            .isCalledOnce()
+    }
+
     @Test
     fun `when classical PushData is received, but notifications are disabled, nothing happen`() =
         runTest {
@@ -644,6 +688,9 @@ class DefaultPushHandlerTest {
         elementCallEntryPoint: FakeElementCallEntryPoint = FakeElementCallEntryPoint(),
         notificationChannels: FakeNotificationChannels = FakeNotificationChannels(),
         pushHistoryService: PushHistoryService = FakePushHistoryService(),
+        syncOnNotifiableEvent: SyncOnNotifiableEvent = SyncOnNotifiableEvent {},
+        featureFlagService: FakeFeatureFlagService = FakeFeatureFlagService(),
+        workManagerScheduler: FakeWorkManagerScheduler = FakeWorkManagerScheduler(),
     ): DefaultPushHandler {
         return DefaultPushHandler(
             onNotifiableEventReceived = FakeOnNotifiableEventReceived(onNotifiableEventsReceived),
@@ -661,12 +708,20 @@ class DefaultPushHandlerTest {
             elementCallEntryPoint = elementCallEntryPoint,
             notificationChannels = notificationChannels,
             pushHistoryService = pushHistoryService,
-            resolverQueue = NotificationResolverQueue(notifiableEventResolver = FakeNotifiableEventResolver(notifiableEventsResult), backgroundScope),
+            // We don't use a fake here so we can perform tests that are a bit more end to end
+            resolverQueue = DefaultNotificationResolverQueue(
+                notifiableEventResolver = FakeNotifiableEventResolver(notifiableEventsResult),
+                appCoroutineScope = backgroundScope,
+                workManagerScheduler = workManagerScheduler,
+                featureFlagService = featureFlagService,
+            ),
             appCoroutineScope = backgroundScope,
             fallbackNotificationFactory = FallbackNotificationFactory(
                 clock = FakeSystemClock(),
                 stringProvider = FakeStringProvider(),
-            )
+            ),
+            syncOnNotifiableEvent = syncOnNotifiableEvent,
+            featureFlagService = featureFlagService,
         )
     }
 }

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/push/SyncOnNotifiableEventTest.kt

@@ -18,22 +18,17 @@ import io.element.android.libraries.matrix.test.FakeMatrixClient
 import io.element.android.libraries.matrix.test.FakeMatrixClientProvider
 import io.element.android.libraries.matrix.test.room.FakeBaseRoom
 import io.element.android.libraries.matrix.test.room.FakeJoinedRoom
-import io.element.android.libraries.matrix.test.room.aRoomInfo
 import io.element.android.libraries.matrix.test.sync.FakeSyncService
-import io.element.android.libraries.push.impl.notifications.fixtures.aNotifiableCallEvent
+import io.element.android.libraries.push.api.push.SyncOnNotifiableEvent
-import io.element.android.libraries.push.impl.notifications.fixtures.aNotifiableMessageEvent
+import io.element.android.libraries.push.impl.notifications.fixtures.aNotificationEventRequest
 import io.element.android.services.appnavstate.test.FakeAppForegroundStateService
 import io.element.android.tests.testutils.lambda.assert
 import io.element.android.tests.testutils.lambda.lambdaRecorder
 import io.element.android.tests.testutils.testCoroutineDispatchers
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.TestScope
-import kotlinx.coroutines.test.advanceTimeBy
 import kotlinx.coroutines.test.runTest
 import org.junit.Test
-import java.util.concurrent.atomic.AtomicBoolean
-import kotlin.time.Duration.Companion.seconds
 
 class SyncOnNotifiableEventTest {
     private val startSyncLambda = lambdaRecorder<Result<Unit>> { Result.success(Unit) }
@@ -57,60 +52,19 @@ class SyncOnNotifiableEventTest {
         givenGetRoomResult(A_ROOM_ID, room)
     }
 
-    private val notifiableEvent = aNotifiableMessageEvent()
+    private val notificationRequest = aNotificationEventRequest()
-    private val incomingCallNotifiableEvent = aNotifiableCallEvent()
 
     @Test
     fun `when feature flag is disabled, nothing happens`() = runTest {
         val sut = createSyncOnNotifiableEvent(client = client, isSyncOnPushEnabled = false)
 
-        sut(listOf(notifiableEvent))
+        sut(listOf(notificationRequest))
 
         assert(startSyncLambda).isNeverCalled()
         assert(stopSyncLambda).isNeverCalled()
         assert(subscribeToSyncLambda).isNeverCalled()
     }
 
-    @OptIn(ExperimentalCoroutinesApi::class)
-    @Test
-    fun `when feature flag is enabled, a ringing call waits until the room is in 'in-call' state`() = runTest {
-        val appForegroundStateService = FakeAppForegroundStateService(
-            initialForegroundValue = false,
-        )
-        val sut = createSyncOnNotifiableEvent(client = client, appForegroundStateService = appForegroundStateService, isSyncOnPushEnabled = true)
-
-        val unlocked = AtomicBoolean(false)
-        launch {
-            advanceTimeBy(1.seconds)
-            unlocked.set(true)
-            room.givenRoomInfo(aRoomInfo(hasRoomCall = true))
-        }
-        sut(listOf(incomingCallNotifiableEvent))
-
-        // The process was completed before the timeout
-        assertThat(unlocked.get()).isTrue()
-    }
-
-    @OptIn(ExperimentalCoroutinesApi::class)
-    @Test
-    fun `when feature flag is enabled, a ringing call waits until the room is in 'in-call' state or timeouts`() = runTest {
-        val appForegroundStateService = FakeAppForegroundStateService(
-            initialForegroundValue = false,
-        )
-        val sut = createSyncOnNotifiableEvent(client = client, appForegroundStateService = appForegroundStateService, isSyncOnPushEnabled = true)
-
-        val unlocked = AtomicBoolean(false)
-        launch {
-            advanceTimeBy(120.seconds)
-            unlocked.set(true)
-            room.givenRoomInfo(aRoomInfo(hasRoomCall = true))
-        }
-        sut(listOf(incomingCallNotifiableEvent))
-
-        // Didn't unlock before the timeout
-        assertThat(unlocked.get()).isFalse()
-    }
-
     @Test
     fun `when feature flag is enabled and app is in background, sync is started and stopped`() = runTest {
         val appForegroundStateService = FakeAppForegroundStateService(
@@ -120,7 +74,7 @@ class SyncOnNotifiableEventTest {
 
         appForegroundStateService.isSyncingNotificationEvent.test {
             syncService.emitSyncState(SyncState.Running)
-            sut(listOf(notifiableEvent))
+            sut(listOf(notificationRequest))
 
             // It's initially false
             assertThat(awaitItem()).isFalse()
@@ -141,8 +95,8 @@ class SyncOnNotifiableEventTest {
         val sut = createSyncOnNotifiableEvent(client = client, appForegroundStateService = appForegroundStateService, isSyncOnPushEnabled = true)
 
         appForegroundStateService.isSyncingNotificationEvent.test {
-            launch { sut(listOf(notifiableEvent)) }
+            launch { sut(listOf(notificationRequest)) }
-            launch { sut(listOf(notifiableEvent)) }
+            launch { sut(listOf(notificationRequest)) }
 
             // It's initially false
             assertThat(awaitItem()).isFalse()
@@ -168,7 +122,7 @@ class SyncOnNotifiableEventTest {
             )
         )
         val matrixClientProvider = FakeMatrixClientProvider { Result.success(client) }
-        return SyncOnNotifiableEvent(
+        return DefaultSyncOnNotifiableEvent(
             matrixClientProvider = matrixClientProvider,
             featureFlagService = featureFlagService,
             appForegroundStateService = appForegroundStateService,

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/workmanager/FetchNotificationWorkerTest.kt

@@ -0,0 +1,206 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.impl.workmanager
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.work.Data
+import androidx.work.ListenableWorker
+import androidx.work.WorkerParameters
+import androidx.work.impl.utils.taskexecutor.WorkManagerTaskExecutor
+import androidx.work.workDataOf
+import com.google.common.truth.Truth.assertThat
+import com.google.common.util.concurrent.ListenableFuture
+import io.element.android.features.networkmonitor.api.NetworkStatus
+import io.element.android.features.networkmonitor.test.FakeNetworkMonitor
+import io.element.android.libraries.push.api.push.SyncOnNotifiableEvent
+import io.element.android.libraries.push.impl.notifications.FakeNotifiableEventResolver
+import io.element.android.libraries.push.impl.notifications.NotificationResolverQueue
+import io.element.android.libraries.push.impl.notifications.fixtures.aNotifiableMessageEvent
+import io.element.android.libraries.push.impl.notifications.model.ResolvedPushEvent
+import io.element.android.libraries.push.test.notifications.FakeNotificationResolverQueue
+import io.element.android.libraries.workmanager.api.WorkManagerRequest
+import io.element.android.libraries.workmanager.api.di.MetroWorkerFactory
+import io.element.android.libraries.workmanager.test.FakeWorkManagerScheduler
+import io.element.android.tests.testutils.lambda.lambdaRecorder
+import io.element.android.tests.testutils.testCoroutineDispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestScope
+import kotlinx.coroutines.test.advanceTimeBy
+import kotlinx.coroutines.test.runTest
+import kotlinx.serialization.json.Json
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.util.UUID
+import java.util.concurrent.Executor
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
+import kotlin.time.Duration.Companion.seconds
+
+@OptIn(ExperimentalCoroutinesApi::class)
+@RunWith(AndroidJUnit4::class)
+class FetchNotificationWorkerTest {
+    @Test
+    fun `test - success`() = runTest {
+        var synced = false
+        val syncOnNotifiableEventLambda = SyncOnNotifiableEvent { synced = true }
+
+        val queue = FakeNotificationResolverQueue(
+            processingLambda = { Result.success(ResolvedPushEvent.Event(aNotifiableMessageEvent())) }
+        )
+        val worker = createWorker(
+            input = """
+            [
+                {
+                    "session_id": "@alice:matrix.org",
+                    "room_id": "!roomid:matrix.org",
+                    "event_id": "$1436ebk:matrix.org",
+                    "provider_info": "some_info"
+                }
+            ]
+            """.trimIndent(),
+            queue = queue,
+            syncOnNotifiableEvent = syncOnNotifiableEventLambda,
+        )
+
+        val result = worker.doWork()
+
+        // The process finished successfully
+        assertThat(result).isEqualTo(ListenableWorker.Result.success())
+
+        // A result was emitted
+        assertThat(queue.results.replayCache).isNotEmpty()
+
+        // An opportunistic sync was triggered
+        assertThat(synced).isTrue()
+    }
+
+    @Test
+    fun `test - invalid input fails the work`() = runTest {
+        val worker = createWorker(
+            input = """
+            [
+                {
+                    "session_id": "!alice:matrix.org",
+                    "room_id": "!roomid:matrix.org",
+                    "event_id": "$1436ebk:matrix.org",
+                    "provider_info": "some_info"
+                }
+            ]
+            """.trimIndent(),
+        )
+
+        val result = worker.doWork()
+
+        // The process failed
+        assertThat(result).isEqualTo(ListenableWorker.Result.failure())
+    }
+
+    @Test
+    fun `test - no network connectivity fails the work`() = runTest {
+        val networkMonitor = FakeNetworkMonitor(initialStatus = NetworkStatus.Disconnected)
+        val worker = createWorker(
+            input = """
+            [
+                {
+                    "session_id": "@alice:matrix.org",
+                    "room_id": "!roomid:matrix.org",
+                    "event_id": "$1436ebk:matrix.org",
+                    "provider_info": "some_info"
+                }
+            ]
+            """.trimIndent(),
+            networkMonitor = networkMonitor,
+        )
+
+        val result = worker.doWork()
+
+        advanceTimeBy(10.seconds)
+
+        // The process failed due to a timeout in getting the network connectivity, a retry is scheduled
+        assertThat(result).isEqualTo(ListenableWorker.Result.retry())
+    }
+
+    @Test
+    fun `test - failing to resolve events re-schedules the work`() = runTest {
+        val submitWorkerLambda = lambdaRecorder<WorkManagerRequest, Unit> {}
+        val scheduler = FakeWorkManagerScheduler(submitLambda = submitWorkerLambda)
+
+        val resolver = FakeNotifiableEventResolver(
+            resolveEventsResult = { _, _ -> Result.failure(Exception("Failed to resolve events")) }
+        )
+
+        val worker = createWorker(
+            input = """
+            [
+                {
+                    "session_id": "@alice:matrix.org",
+                    "room_id": "!roomid:matrix.org",
+                    "event_id": "$1436ebk:matrix.org",
+                    "provider_info": "some_info"
+                }
+            ]
+            """.trimIndent(),
+            eventResolver = resolver,
+            workManagerScheduler = scheduler,
+        )
+
+        val result = worker.doWork()
+
+        // The process was considered successful, but a retry was scheduled due to the failure to resolve events
+        assertThat(result).isEqualTo(ListenableWorker.Result.success())
+        submitWorkerLambda.assertions().isCalledOnce()
+    }
+
+    private fun TestScope.createWorker(
+        input: String,
+        networkMonitor: FakeNetworkMonitor = FakeNetworkMonitor(),
+        eventResolver: FakeNotifiableEventResolver = FakeNotifiableEventResolver(resolveEventsResult = { _, _ -> Result.success(emptyMap()) }),
+        queue: NotificationResolverQueue = FakeNotificationResolverQueue(
+            processingLambda = { Result.success(ResolvedPushEvent.Event(aNotifiableMessageEvent())) }
+        ),
+        workManagerScheduler: FakeWorkManagerScheduler = FakeWorkManagerScheduler(),
+        syncOnNotifiableEvent: SyncOnNotifiableEvent = SyncOnNotifiableEvent {},
+    ) = FetchNotificationsWorker(
+        workerParams = createWorkerParams(workDataOf("requests" to input)),
+        context = InstrumentationRegistry.getInstrumentation().context,
+        networkMonitor = networkMonitor,
+        eventResolver = eventResolver,
+        queue = queue,
+        workManagerScheduler = workManagerScheduler,
+        syncOnNotifiableEvent = syncOnNotifiableEvent,
+        coroutineDispatchers = testCoroutineDispatchers(),
+        json = Json {},
+    )
+
+    private fun TestScope.createWorkerParams(
+        inputData: Data = Data.EMPTY,
+    ): WorkerParameters = WorkerParameters(
+        UUID.randomUUID(),
+        inputData,
+        emptySet(),
+        WorkerParameters.RuntimeExtras(),
+        0,
+        0,
+        Executors.newSingleThreadExecutor(),
+        backgroundScope.coroutineContext,
+        WorkManagerTaskExecutor(Executors.newSingleThreadExecutor()),
+        MetroWorkerFactory(emptyMap()),
+        { context, id, data -> FakeListenableFuture() },
+        { context, id, foregroundInfo -> FakeListenableFuture() },
+    )
+}
+
+class FakeListenableFuture<T> : ListenableFuture<T> {
+    override fun addListener(listener: Runnable, executor: Executor) = Unit
+    override fun cancel(mayInterruptIfRunning: Boolean): Boolean = true
+    override fun get(): T? = null
+    override fun get(timeout: Long, unit: TimeUnit?): T? = null
+    override fun isCancelled(): Boolean = false
+    override fun isDone(): Boolean = false
+}

libraries/push/impl/src/test/kotlin/io/element/android/libraries/push/impl/workmanager/SyncNotificationWorkManagerRequestTest.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.impl.workmanager
+
+import androidx.work.OneTimeWorkRequest
+import androidx.work.hasKeyWithValueOfType
+import com.google.common.truth.Truth.assertThat
+import io.element.android.libraries.matrix.test.A_SESSION_ID
+import io.element.android.libraries.push.impl.notifications.fixtures.aNotificationEventRequest
+import io.element.android.libraries.workmanager.api.WorkManagerRequestType
+import io.element.android.libraries.workmanager.api.workManagerTag
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+class SyncNotificationWorkManagerRequestTest {
+    @Test
+    fun `build - success`() = runTest {
+        val request = SyncNotificationWorkManagerRequest(
+            sessionId = A_SESSION_ID,
+            notificationEventRequests = listOf(aNotificationEventRequest())
+        )
+
+        val result = request.build()
+        assertThat(result.isSuccess).isTrue()
+        result.getOrNull()!!.run {
+            assertThat(this).isInstanceOf(OneTimeWorkRequest::class.java)
+            assertThat(workSpec.input.hasKeyWithValueOfType<String>("requests")).isTrue()
+            assertThat(workSpec.expedited).isTrue()
+            assertThat(workSpec.traceTag).isEqualTo(workManagerTag(A_SESSION_ID, WorkManagerRequestType.NOTIFICATION_SYNC))
+        }
+    }
+
+    @Test
+    fun `build - empty list of requests fails`() = runTest {
+        val request = SyncNotificationWorkManagerRequest(
+            sessionId = A_SESSION_ID,
+            notificationEventRequests = emptyList()
+        )
+
+        val result = request.build()
+        assertThat(result.isFailure).isTrue()
+    }
+
+    // TODO add test for invalid serialization (how?)
+}

libraries/push/test/src/main/kotlin/io/element/android/libraries/push/test/notifications/FakeNotificationResolverQueue.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.test.notifications
+
+import io.element.android.libraries.push.api.push.NotificationEventRequest
+import io.element.android.libraries.push.impl.notifications.NotificationResolverQueue
+import io.element.android.libraries.push.impl.notifications.model.ResolvedPushEvent
+import kotlinx.coroutines.flow.MutableSharedFlow
+
+class FakeNotificationResolverQueue(
+    private val processingLambda: suspend (NotificationEventRequest) -> Result<ResolvedPushEvent>,
+) : NotificationResolverQueue {
+    override val results = MutableSharedFlow<Pair<List<NotificationEventRequest>, Map<NotificationEventRequest, Result<ResolvedPushEvent>>>>(replay = 1)
+
+    override suspend fun enqueue(request: NotificationEventRequest) {
+        results.emit(listOf(request) to mapOf(request to processingLambda(request)))
+    }
+}

libraries/workmanager/api/build.gradle.kts

@@ -0,0 +1,23 @@
+import extension.setupDependencyInjection
+
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.libraries.workmanager.api"
+}
+
+setupDependencyInjection()
+
+dependencies {
+    api(libs.androidx.workmanager.runtime)
+
+    implementation(projects.libraries.matrix.api)
+}

libraries/workmanager/api/src/main/kotlin/io/element/android/libraries/workmanager/api/WorkManagerRequest.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.workmanager.api
+
+import androidx.work.WorkRequest
+
+interface WorkManagerRequest {
+    fun build(): Result<WorkRequest>
+}

libraries/workmanager/api/src/main/kotlin/io/element/android/libraries/workmanager/api/WorkManagerScheduler.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.workmanager.api
+
+import io.element.android.libraries.matrix.api.core.SessionId
+
+interface WorkManagerScheduler {
+    fun submit(workManagerRequest: WorkManagerRequest)
+    fun cancel(sessionId: SessionId)
+}
+
+fun workManagerTag(sessionId: SessionId, requestType: WorkManagerRequestType): String {
+    val prefix = when (requestType) {
+        WorkManagerRequestType.NOTIFICATION_SYNC -> "notifications"
+    }
+    return "$prefix-$sessionId"
+}
+
+enum class WorkManagerRequestType {
+    NOTIFICATION_SYNC,
+}

libraries/workmanager/api/src/main/kotlin/io/element/android/libraries/workmanager/api/di/MetroWorkerFactory.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.workmanager.api.di
+
+import android.content.Context
+import androidx.work.ListenableWorker
+import androidx.work.WorkerFactory
+import androidx.work.WorkerParameters
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.ContributesBinding
+import dev.zacsweers.metro.Inject
+import kotlin.reflect.KClass
+
+@ContributesBinding(AppScope::class)
+@Inject
+class MetroWorkerFactory(
+    val workerProviders: Map<KClass<out ListenableWorker>, WorkerInstanceFactory<*>>
+) : WorkerFactory() {
+    override fun createWorker(
+        appContext: Context,
+        workerClassName: String,
+        workerParameters: WorkerParameters,
+    ): ListenableWorker? {
+      return workerProviders[Class.forName(workerClassName).kotlin]?.create(workerParameters)
+    }
+
+    interface WorkerInstanceFactory<T : ListenableWorker> {
+      fun create(params: WorkerParameters): T
+    }
+}

libraries/workmanager/api/src/main/kotlin/io/element/android/libraries/workmanager/api/di/WorkerKey.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.workmanager.api.di
+
+import androidx.work.ListenableWorker
+import dev.zacsweers.metro.MapKey
+import kotlin.reflect.KClass
+
+/** A [MapKey] annotation for binding Worker in a multibinding map. */
+@MapKey
+@Target(AnnotationTarget.CLASS, AnnotationTarget.PROPERTY)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class WorkerKey(val value: KClass<out ListenableWorker>)

libraries/workmanager/impl/build.gradle.kts

@@ -0,0 +1,24 @@
+import extension.setupDependencyInjection
+
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.libraries.workmanager.impl"
+}
+
+setupDependencyInjection()
+
+dependencies {
+    api(projects.libraries.workmanager.api)
+    implementation(projects.libraries.core)
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.libraries.di)
+}

libraries/workmanager/impl/src/main/kotlin/io/element/android/libraries/workmanager/impl/DefaultWorkManagerScheduler.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.workmanager.impl
+
+import android.content.Context
+import androidx.work.WorkManager
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.ContributesBinding
+import dev.zacsweers.metro.Inject
+import io.element.android.libraries.di.annotations.ApplicationContext
+import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.workmanager.api.WorkManagerRequest
+import io.element.android.libraries.workmanager.api.WorkManagerRequestType
+import io.element.android.libraries.workmanager.api.WorkManagerScheduler
+import io.element.android.libraries.workmanager.api.workManagerTag
+import timber.log.Timber
+
+@ContributesBinding(AppScope::class)
+@Inject
+class DefaultWorkManagerScheduler(
+    @ApplicationContext private val context: Context,
+) : WorkManagerScheduler {
+    private val workManager by lazy { WorkManager.getInstance(context) }
+
+    override fun submit(workManagerRequest: WorkManagerRequest) {
+        workManagerRequest.build().fold(
+            onSuccess = {
+                workManager.enqueue(it)
+            },
+            onFailure = {
+                Timber.e(it, "Failed to build WorkManager request $workManagerRequest")
+            }
+        )
+    }
+
+    override fun cancel(sessionId: SessionId) {
+        Timber.d("Cancelling work for sessionId: $sessionId")
+        for (requestType in WorkManagerRequestType.entries) {
+            workManager.cancelAllWorkByTag(workManagerTag(sessionId, requestType))
+        }
+    }
+}

libraries/workmanager/test/build.gradle.kts

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.libraries.workmanager.test"
+}
+
+dependencies {
+    api(projects.libraries.workmanager.api)
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.tests.testutils)
+}

libraries/workmanager/test/src/main/kotlin/io/element/android/libraries/workmanager/test/FakeWorkManagerScheduler.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.workmanager.test
+
+import io.element.android.libraries.matrix.api.core.SessionId
+import io.element.android.libraries.workmanager.api.WorkManagerRequest
+import io.element.android.libraries.workmanager.api.WorkManagerScheduler
+import io.element.android.tests.testutils.lambda.lambdaError
+
+class FakeWorkManagerScheduler(
+    private val submitLambda: (WorkManagerRequest) -> Unit = { lambdaError() },
+    private val cancelLambda: (SessionId) -> Unit = { lambdaError() },
+) : WorkManagerScheduler {
+    override fun submit(workManagerRequest: WorkManagerRequest) {
+        submitLambda(workManagerRequest)
+    }
+
+    override fun cancel(sessionId: SessionId) {
+        cancelLambda(sessionId)
+    }
+}

plugins/src/main/kotlin/extension/DependencyHandleScope.kt

@@ -118,6 +118,7 @@ fun DependencyHandlerScope.allLibrariesImpl() {
     implementation(project(":libraries:fullscreenintent:impl"))
     implementation(project(":libraries:wellknown:impl"))
     implementation(project(":libraries:oidc:impl"))
+    implementation(project(":libraries:workmanager:impl"))
 }
 
 fun DependencyHandlerScope.allServicesImpl() {

tests/konsist/src/test/kotlin/io/element/android/tests/konsist/KonsistClassNameTest.kt

@@ -100,6 +100,7 @@ class KonsistClassNameTest {
             .withoutName(
                 "FakeFileSystem",
                 "FakeImageLoader",
+                "FakeListenableFuture",
             )
             .assertTrue {
                 val interfaceName = it.name
@@ -149,6 +150,7 @@ class KonsistClassNameTest {
                 "Factory",
                 "TimelineController",
                 "TimelineMediaGalleryDataSource",
+                "MetroWorkerFactory",
             )
             .withoutNameStartingWith(
                 "Accompanist",