Progress Tracker · Android Interview Prep

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🎥 Pitches recorded & reviewed

⚙️ Kotlin & coroutines mastery

Idiomatic Kotlin: null-safety, data/sealed classes, scope functions
Generics & variance (in/out), inline + reified
Structured concurrency, scopes, cancellation, main-safety
Dispatchers (Main/IO/Default) and injecting them for tests
Flow operators, StateFlow vs SharedFlow, stateIn(WhileSubscribed)
Lifecycle-safe collection (repeatOnLifecycle / collectAsStateWithLifecycle)

🎨 Jetpack Compose mastery

Composition, recomposition scope & the 3 phases
State hoisting, remember vs rememberSaveable
Side-effects: LaunchedEffect, DisposableEffect, derivedStateOf, produceState
Stability / skippability and immutable collections
Compose performance: deferred reads, keys, compiler metrics
Compose UI testing via the semantics tree

🏛 Architecture & Jetpack

MVVM / MVI and unidirectional data flow
Clean Architecture layers & single source of truth
Repository pattern & DTO→domain mapping
Hilt/Dagger: modules, scopes, @Binds vs @Provides, qualifiers
Room (Flow DAOs, migrations) & DataStore vs SharedPreferences
Retrofit/OkHttp, interceptors, Authenticator, offline-first
Navigation-Compose, typed routes & deep links
WorkManager vs Service vs coroutine for background work
Modularization strategy & build boundaries

🚀 Performance, testing & release

Jank & frame timing (JankStats, Macrobenchmark, Perfetto)
Baseline Profiles & cold-start optimization
Memory leaks (LeakCanary) & ANRs (main-thread discipline)
R8/ProGuard, App Bundle, App Startup
Test pyramid: JUnit, MockK, Turbine, Robolectric, Espresso
Gradle variants/flavors, version catalogs, KSP vs kapt
CI/CD, signing, staged rollout, crash-free rate

🔐 Security & frontier

Keystore, EncryptedSharedPreferences, BiometricPrompt
Network Security Config, cert pinning, Play Integrity
OWASP MASVS / Mobile Top 10 vocabulary
On-device AI: Gemini Nano (AICore), MediaPipe LLM, TFLite trade-offs

✅ Final checks before the call

Researched the company's app, stack & the team you'd join
Score 90%+ on the Quiz tab
3 STAR stories rehearsed out loud (performance, ownership, adaptability)
All Q&A flashcards graded “Known”
Camera, mic, lighting & quiet space tested; CV reviewed