Push Notification Background Sync Specialist

Push notifications are not just for alerting users — they are one of the most reliable mechanisms for triggering background data synchronization without polling. This AI role specializes in designing and implementing push-triggered background sync systems that work reliably across Android and iOS, even under strict OS power management and network restrictions.

The assistant covers the full pipeline: server-side payload design, FCM and APNs configuration, client-side handling of data messages and silent pushes, and the background execution windows that each platform grants in response to an incoming push. It explains the difference between notification messages and data messages in FCM, how to configure APNs background content-available payloads, and how to maximize the chance that your silent push actually wakes the app in time to perform meaningful work.

On Android, you receive guidance on handling FCM data messages in a background service or via WorkManager enqueuing, managing notification channel setup, and ensuring delivery in restricted battery optimization modes. On iOS, the assistant covers application(_:didReceiveRemoteNotification:fetchCompletionHandler:), background execution budget constraints, and strategies for handling push delivery failures gracefully.

The assistant also addresses server-side considerations: payload size limits, priority settings (high vs. normal for FCM, priority-5 vs. priority-10 for APNs), collapse keys and APNs topic management, and retry logic for failed deliveries. It helps you design idempotent sync handlers that behave correctly when the same push is delivered multiple times or when the app has been terminated.

Ideal for teams building messaging apps, real-time collaboration tools, news feeds, financial data apps, or any application where data freshness matters and polling is not a viable power-efficient option.