A comprehensive guide to prepare for React Native developer interviews, covering everything from core concepts to advanced system design patterns. This repository is structured to help developers at all levels master React Native fundamentals, best practices, and real-world scenarios commonly asked in technical interviews.
Foundational React concepts essential for React Native development:
- JSX, Components (Functional vs Class)
- State & Props
- Lifecycle Methods vs Hooks
- useState, useEffect, useRef, useMemo, useCallback
- Conditional Rendering
- List Rendering (FlatList, SectionList)
- Context API
Core React Native components and concepts:
- RN Components: View, Text, Image, ScrollView, TouchableOpacity, etc.
- Styling with StyleSheet and Flexbox
- React Native Bridge Concept (JS thread, Native UI thread)
- Navigation (React Navigation, Expo Router, File-based navigation)
- Handling User Input: TextInput, KeyboardAvoidingView
- Platform-specific code: Platform.OS, .ios.js/.android.js
- Permissions (location, camera, etc.)
Understanding the Expo ecosystem and native module integration:
- Expo build lifecycle (EAS build, publish, updates)
- Expo SDK modules: ImagePicker, Location, FileSystem, Notifications
- Limitations of Expo vs Bare workflow
- How to eject to Bare workflow
Modern state management solutions and patterns:
- Basic: useState, useReducer
- Context API
- Redux or Redux Toolkit (common in companies)
- Zustand or Jotai (newer stacks)
- Async operations (Redux Thunk, Redux Saga)
Navigation patterns and implementation:
- Difference between Stack, Tab, Drawer navigation
- Passing data between screens
- Programmatic navigation
- Deep linking
- Authentication flow (login → protected screens)
Backend communication and data handling:
- REST API calls (fetch, axios)
- Error handling patterns
- Pagination (infinite scroll)
- Debouncing & throttling
- Token handling (access token, refresh token)
- Offline-first apps
- Caching (AsyncStorage or libraries like react-query)
Techniques to optimize React Native app performance:
- Performance profiling and monitoring
- Reducing bundle size
- Optimizing FlatList performance
- Image optimization strategies
- Memory management
- Preventing unnecessary re-renders
Local data persistence solutions:
- AsyncStorage
- SecureStore (Expo)
- SQLite integration
- Realm/WatermelonDB
- Encryption basics
Authentication patterns and implementation:
- Email-password auth flow
- OTP-based authentication
- JWT workflow (access/refresh tokens)
- Protected routes and navigation
- Firebase Auth integration
- Social login (Google, Apple, Facebook)
Testing strategies for React Native apps:
- Jest for unit testing
- React Native Testing Library
- Snapshot testing
- Detox for E2E testing
Debugging techniques and development tools:
- React Native Debugger/Flipper
- Chrome vs VS Code debugger
- Performance profiling tools
- Handling crashes (Sentry, Bugsnag)
Build and release processes:
- Android: APK vs AAB, Keystore management
- Play Store release steps
- iOS: App Store release, Certificates, Provisioning Profiles
- Expo EAS configurations and profiles
- OTA (Over-The-Air) updates with Expo
Core architectural concepts:
- JavaScript engines (Hermes vs JavaScriptCore)
- Native Modules & Native UI Components
- Threading (JS Thread, Shadow Thread, UI Thread)
- Fabric architecture (new architecture)
Advanced topics for senior developer interviews:
- How to structure a scalable RN project
- Folder structure best practices
- Handling performance issues at scale
- Managing app state in large applications
- Offline-first architecture
- Sequential Learning: Follow the numbered sections in order for comprehensive coverage
- Topic-Specific Review: Jump to specific sections based on your interview requirements
- Quick Reference: Each file contains concise summaries and one-line answers
- Practice: Code examples and implementation patterns are included throughout
- ✅ Interview-Ready Explanations: Each topic includes sample interview answers
- ✅ Practical Code Examples: Real-world implementation patterns
- ✅ Comparison Tables: Side-by-side comparisons of different approaches
- ✅ Best Practices: Industry-standard patterns and conventions
- ✅ Common Pitfalls: What to avoid and why
- ✅ Q&A Sections: Frequently asked interview questions with answers
This is a personal interview preparation repository. Feel free to fork and customize for your own needs.
This repository is for educational purposes.
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Good luck with your React Native interviews! 🚀