Android Roadmap 2027

The complete Android path, from fundamentals to senior

Nine stages in learning order. Every topic gets a simple explanation, a small repo you can run, and interview questions to test yourself.

1. Go in order. Each stage builds on the one before.
2. Learn, then build. Read the post, run the repo, break it.
3. Test yourself. Move on when you pass the "done when" check.

1. 1

   Stage 1: Kotlin and DSA basics

   In progress

   You're done when you can build and test a small Kotlin project and explain your choices. What to learn

   • Null safety
   • Any, Unit and Nothing
   • Data class vs regular class
   • Sealed class vs enum
   • Value classes
   • object, companion object and inner classes
   • val, var and backing properties
   • lazy vs lateinit
   • Higher-order functions and lambdas
   • inline and reified
   • Extension and scope functions
   • Collections vs Sequences
   • DSA in Kotlin: 12 patterns
2. 2

   Stage 2: The Android platform

   Planned

   You're done when you can say what happens when the OS kills your app, and prove state comes back. What to learn

   App components · Lifecycle · Process death and saved state · Edge-to-edge and insets · Runtime permissions · Background limits and WorkManager

3. 3

   Stage 3: Coroutines and Flow

   Planned

   You're done when you can handle cancel, failure and two requests at once without bugs. What to learn

   Structured concurrency · Cancellation · Dispatchers and threads · Exceptions in coroutines · Cold vs hot flows · StateFlow vs SharedFlow

4. 4

   Stage 4: Compose UI

   Planned

   You're done when you can build a multi-screen app with loading, error, empty and data states. What to learn

   State and recomposition · Side effects · Navigation 3 · Adaptive layouts

5. 5

   Stage 5: Architecture

   Planned

   You're done when you can defend every layer in a feature you designed. What to learn

   UI and data layers · One-way data flow · ViewModel internals · Dependency injection · Modules

6. 6

   Stage 6: Data and offline

   Planned

   You're done when you can keep a feature useful when the network is slow or gone. What to learn

   HTTP and networking · Room · DataStore · Caching · Offline-first sync · Database migrations

7. 7

   Stage 7: Testing

   Planned

   You're done when you can catch a real regression automatically. What to learn

   Fakes vs mocks · Testing ViewModels and Flows · Compose UI tests · CI for Android

8. 8

   Stage 8: Production

   Planned

   You're done when you can reproduce a problem, fix it, and show before and after numbers. What to learn

   Profiling · Jank · ANRs · Baseline Profiles · R8 · App security · Releases

9. 9

   Stage 9: System design

   Planned

   You're done when you can design an app and defend it against two alternatives. What to learn

   Mobile system design · Sync and failure handling · Android internals