Background Work and Battery Optimization Questions

Practical knowledge of background execution models and strategies to minimize power consumption on mobile devices, across both Android and iOS. Topics include platform scheduling frameworks (Android WorkManager and JobScheduler, foreground services, iOS BGTaskScheduler and Background App Refresh), batching and deferring work, handling platform power-saving states (Android Doze mode and App Standby, iOS Low Power Mode), efficient location and sensor handling, minimizing wake locks and network usage, retry and exponential backoff strategies, and measuring battery impact with platform profilers (Android Battery Historian/Profiler, iOS Instruments Energy Log). Candidates should be able to pick the right background mechanism for a requirement, reason about timeliness versus power trade offs, and describe concrete steps to reduce CPU, GPU, and network induced battery drain.