Intermediate

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State, async UI, and lists the way mid-level interviews expect you to reason about them.

Done	Problem	Resources	Note	Revision	Difficulty
	Provider In-Depth				Medium
	Riverpod Deep Dive				Medium
	BLoC Pattern				Hard
	InheritedWidget Internals				Medium
	BehaviorSubject (RxDart)				Medium
	Sealed Classes for State				Medium
	Dependency Injection in Flutter				Medium
	Mixins				Medium
	WidgetsBindingObserver				Medium
	Tree Shaking				Medium
	Singleton Pattern Drawbacks				Easy
	Global Error Handling				Medium
	vsync and TickerProvider				Medium
	Implicit vs Explicit Animations				Medium
	Staggered Animations				Medium
	HTTP Requests with Dio				Medium
	Certificate Pinning				Hard
	Secure Storage				Medium
	Retry Logic with Exponential Backoff				Medium
	Three Trees (Widget/Element/RenderObject)				Hard
	Impeller Rendering Engine				Hard
	AOT vs JIT Compilation				Medium
	Code Obfuscation				Hard
	CPU Flame Chart: identify slow calls and instrument Timeline events				Medium
	Memory Profiler: heap snapshots, GC diffing, and leak hunting				Medium
	Performance View: frame analysis and jank tracing in profile mode				Medium