Android SDK, Kotlin, Git, Opengl Es, MVVM, JNI, Debugging, Ndk, Canvas, WebView internals, MediaProjection, Perfetto, Flow, multi-flavor Gradle builds, Coroutines, code review workflows, Android Studio Profiler, SSE streaming APIs, performance profiling, MVI architecture, SurfaceView, Filament, Custom Views, ProGuard R8, native crash debugging