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Concurrency, platform boundaries, and rendering depth for senior-level probes.

Done	Problem	Resources	Note	Revision	Difficulty
	Platform Channels				Hard
	FFI (Foreign Function Interface)				Hard
	Deep Linking with go_router				Hard
	App Startup Optimization				Hard
	Complex Async State with Riverpod				Hard
	Mocking Dependencies				Medium
	Integration Tests				Medium
	Golden Testing				Medium
	Memory Leak Detection				Hard
	Custom RenderObjects				Hard
	Efficient Pagination				Hard
	API Response Caching				Medium
	Runtime Permissions				Hard
	Background Tasks (WorkManager)				Hard
	Push Notifications				Hard
	In-App Purchases				Hard
	Analytics & Crash Reporting				Medium
	Code Coverage				Medium
	Feature Flags & A/B Testing				Medium
	Design System Implementation				Hard
	CI/CD Pipeline Setup				Medium
	Modular Architecture				Hard
	App Update Management				Medium
	Localization (i18n)				Medium
	Accessibility (a11y)				Hard