Updated April 2026

100% Free Mid-Level to Senior No Signup

Android Interview Mastery: Zero to Senior in 83 Lessons

Land Your Senior Android Role — 83 Interview-Focused Lessons — Kotlin, Coroutines, Compose, Architecture, Paging, Animations, Testing & Behavioral | Free, No Signup | by Teamz Lab

83Lessons
~10 minPer Lesson
$0Forever
16Topics
Start Lesson 1 — Free See Curriculum

What you'll learn

Kotlin
Coroutines
Flow
Jetpack Compose
MVVM
Clean Architecture
Hilt
Room
Retrofit
WorkManager
Testing
CI/CD
System Design
Performance
Firebase
Security

Full curriculum

83 lessons organized by topic. Click any lesson to jump straight in.

1. Kotlin Core (6 lessons)

  1. 1Kotlin Basics: val/var, Null Safety, Smart Casts & Data Classes
  2. 2Collections, Lambdas, Scope Functions & Higher-Order Functions
  3. 3OOP in Kotlin: Interfaces, Abstract Classes & Composition
  4. 4Sealed Classes, Enums, Objects & Companion Objects
  5. 5Generics, Variance, Extension Functions & Inline/Reified
  6. 6Exceptions, Result & Defensive Kotlin

2. Coroutines & Flow (4 lessons)

  1. 7Coroutines Fundamentals: suspend, Structured Concurrency & Dispatchers
  2. 8Coroutine Cancellation, SupervisorScope & Exception Handling
  3. 9Flow Fundamentals: Cold Streams, Operators & Collection
  4. 10StateFlow vs SharedFlow vs LiveData vs Channels

3. Android Architecture (6 lessons)

  1. 11Android Architecture Timeline: MVC, MVP, MVVM, MVI & Clean Architecture
  2. 12Android App Components: Activity, Fragment, Service, BroadcastReceiver & ContentProvider
  3. 13Activity & Fragment Lifecycle, Configuration Changes
  4. 14Intents, PendingIntents, Task Stack & Launch Modes
  5. 15ViewModel, Lifecycle-Aware State & SavedStateHandle
  6. 16LiveData Legacy Knowledge for Modern Interviews

4. UI: XML & Compose (6 lessons)

  1. 17XML View System: Layouts, ConstraintLayout & RecyclerView
  2. 18Jetpack Compose Fundamentals: Composable Functions, State & Recomposition
  3. 19Compose State: remember, rememberSaveable & State Hoisting
  4. 20Compose Side Effects: LaunchedEffect, SideEffect, DisposableEffect & derivedStateOf
  5. 21Compose Performance: Recomposition Traps, Keys & Stability
  6. 22Navigation in Android: Fragment Nav vs Compose Nav vs Deep Links

5. Architecture Patterns (4 lessons)

  1. 23Clean Architecture for Android
  2. 24Repository Pattern, Use Cases & Dependency Inversion
  3. 25MVVM vs MVI vs Clean — Tradeoffs & Interview Answers
  4. 26Dependency Injection: Manual DI vs Hilt vs Dagger

6. Networking & Data (5 lessons)

  1. 27Retrofit, OkHttp, Interceptors, Token Refresh & Pagination
  2. 28Room, SQLite, Migrations, Transactions & Relations
  3. 29DataStore vs SharedPreferences vs Room — When to Choose
  4. 30Offline-First Sync, Caching, Conflict Resolution
  5. 31Firebase on Android: Auth, FCM, Analytics, Crashlytics, Remote Config

7. Background & Platform (4 lessons)

  1. 32WorkManager, Background Tasks, Foreground Services & Alarm Limitations
  2. 33Notifications, Channels, Push Flows, Deep Links & App Links
  3. 34Android Permissions, Storage Changes & Privacy-Safe Handling
  4. 35Security: JWT, Secure Storage, Encryption & Biometrics

8. Performance & Debugging (2 lessons)

  1. 36Android Performance: ANR, Jank, Memory Leaks & Startup Time
  2. 37Profiling & Debugging: Logcat, Android Studio Profiler, LeakCanary & StrictMode

9. Testing (6 lessons)

  1. 38Testing Strategy: Unit vs Instrumentation vs UI Tests
  2. 39Unit Testing Kotlin: Classes, Use Cases & Repositories
  3. 40ViewModel & Flow Testing: Coroutine Test Utilities
  4. 41Room/Repository/Network Testing: Mocks vs Fakes
  5. 42Compose UI Testing Fundamentals
  6. 43Espresso Legacy Awareness & Instrumentation Basics

10. Build & Release (4 lessons)

  1. 44Modularization, Feature Modules & Build Tradeoffs
  2. 45Gradle Basics, Dependencies, Build Variants & Product Flavors
  3. 46Signing, Release Builds, Play Console & Versioning
  4. 47CI/CD for Android: GitHub Actions, Fastlane & Bitrise

11. Crossover & Polish (7 lessons)

  1. 48Kotlin Flow vs Dart Stream vs Rx — Crossover Interview Advantage
  2. 49Jetpack Compose vs Flutter — How to Answer Without Sounding Biased
  3. 50Accessibility on Android: TalkBack, Semantics & Touch Targets
  4. 51Localization, RTL, Formatting & Resource Management
  5. 52Adaptive Android UI: Phones, Tablets, Foldables & Multi-Window
  6. 53Material Design 3, Theming, Dark Mode & Dynamic Color
  7. 54RecyclerView vs LazyColumn: Legacy vs Modern UI Tradeoffs

12. Legacy & Platform APIs (3 lessons)

  1. 55BroadcastReceiver, Services, Binder & Bound Services
  2. 56ContentProvider, FileProvider & URI Permissions
  3. 57Native/Platform APIs: Camera, Bluetooth, NFC, Sensors & Maps

13. System Design (4 lessons)

  1. 58System Design I: Offline-First Field App at Scale
  2. 59System Design II: School/Productivity App with Local DB & Sync
  3. 60System Design III: Secure Auth/Payment/Claims Flow
  4. 61Production Debugging, Incident Response & Crash Triage

14. CS & DSA (4 lessons)

  1. 62CS Basics: Big-O, Memory, Threading & Networking
  2. 63DSA I: Arrays, Strings, HashMaps, Sets & Two Pointers
  3. 64DSA II: Stack, Queue, Linked List, Binary Search & Heap
  4. 65DSA III: Trees, Graphs, BFS/DFS, Recursion & Intervals

15. Behavioral & Career (7 lessons)

  1. 66Android Interview Project Storytelling Foundations
  2. 67Behavioral Foundations: W-STAR, Confidence & Concise Answers
  3. 68Leadership & Seniority: Mentoring, Ownership, Conflict & Ambiguity
  4. 69Salary Negotiation, Remote Culture & Relocation
  5. 70Full Android Technical Mock Pack
  6. 71Full Architecture + System Design Mock Pack
  7. 72Full Behavioral + Mixed Senior Mobile Mock Pack

16. Advanced Topics (11 lessons)

  1. 73Paging 3: PagingSource, RemoteMediator & Flow Integration
  2. 74Compose Animations: Transition, AnimatedVisibility & Motion
  3. 75Advanced Coroutines: callbackFlow, channelFlow & Custom Dispatchers
  4. 76KSP vs KAPT, Code Generation & Serialization
  5. 77R8, ProGuard & Release Optimization
  6. 78Android 14/15 Platform Features & Migration
  7. 79GraphQL with Apollo Kotlin
  8. 80Baseline Profiles, Macrobenchmark & Startup Optimization
  9. 81Screenshot Testing: Paparazzi, Roborazzi & Visual Regression
  10. 82AOSP & Android Platform Internals for App Developers
  11. 83Java Interop, Legacy Code & Kotlin Migration Strategy
Start the Course — Free

Frequently asked questions

Is this course really free?

Yes — 100% free. No signup, no credit card, no email required. All lessons, quizzes, and certificate of completion are free forever.

Do I need to install anything?

No. The entire course runs in your browser on phone, tablet, or laptop. No downloads, no accounts.

How long does the course take?

About 10 minutes per lesson. One lesson per day takes about 1-2 months total. Many learners finish in 2-3 weeks by doing multiple lessons per sitting.

Will I get a certificate?

Yes. After completing all lessons, generate a personalized certificate with your name and share it on LinkedIn. Not accredited, but signals commitment to recruiters.

Do I need prior experience?

No. Every course is designed for complete beginners. Each lesson starts with a plain-English analogy before any technical concepts.

How is this different from YouTube tutorials?

Three things: interactive — quizzes and hands-on challenges after every lesson; structured — a deliberate learning path, not random videos; gamified — XP, streaks, spaced repetition so knowledge actually sticks.