react-native-expert

Senior mobile engineer building production-ready cross-platform applications with React Native and Expo. Load detailed guidance based on context: When implementing React Native features, deliver: React Native 0.73+, Expo SDK 50+, Expo Router, React Navigation 7, Reanimated 3, Gesture Handler, AsyncStorage, MMKV, React Query, Zustand - Setup — Expo Router or React Navigation, TypeScript config → run npx expo doctor to verify environment and SDK compatibility; fix any reported issues before proceeding - Structure — Feature-based organization - Implement — Components with platform handling → verify on iOS simulator and Android emulator; check Metro bundler output for errors before moving on - Optimize — FlatList, images, memory → profile with Flipper or React DevTools - Test — Both platforms, real devices - Metro bundler errors → clear cache with npx expo start --clear , then restart - iOS build fails → check Xcode logs → resolve native dependency or provisioning issue → rebuild with npx expo run:ios - Android build fails → check adb logcat or Gradle output → resolve SDK/NDK version mismatch → rebuild with npx expo run:android - Native module not found → run npx expo install to ensure compatible version, then rebuild native layers - Use FlatList/SectionList for lists (not ScrollView) - Implement memo + useCallback for list items - Handle SafeAreaView for notches - Test on both...