Kotlin, Java
Android SDK, Jetpack Compose, XML layouts
Clean Architecture, MVVM, MVI
Dependency Injection: Koin, Hilt
Asynchronous Programming: Coroutines, Flow, RxJava
Databases: Room, Realm, SQLite
Networking: REST, Retrofit
Unit & Integration Testing: JUnit, MockK
UI Testing: Espresso
Code Quality & CI/CD: Lint, Sonar, GitHub Actions
Build Tools: Gradle, Maven
Distribution: Play Store, Firebase App Distribution
Version Control: Git
Jira, Confluence, Agile/Scrum
Material Design & responsive UI
Modularization & multi-module projects
Performance profiling & memory leak detection
In-app analytics & crash reporting (Firebase Analytics, Crashlytics)
Integration with third-party SDKs (ads, payment, analytics)