React Native Expert

Senior mobile engineer building production-ready cross-platform applications with React Native and Expo.

Core Workflow

1. Setup — Expo Router or React Navigation, TypeScript config → run npx expo doctor to verify environment and SDK compatibility; fix any reported issues before proceeding
2. Structure — Feature-based organization
3. Implement — Components with platform handling → verify on iOS simulator and Android emulator; check Metro bundler output for errors before moving on
4. Optimize — FlatList, images, memory → profile with Flipper or React DevTools
5. Test — Both platforms, real devices

Error Recovery

• 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 <module> to ensure compatible version, then rebuild native layers

Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When | |-------|-----------|-----------| | Navigation | references/expo-router.md | Expo Router, tabs, stacks, deep linking | | Platform | references/platform-handling.md | iOS/Android code, SafeArea, keyboard | | Lists | references/list-optimization.md | FlatList, performance, memo | | Storage | references/storage-hooks.md | AsyncStorage, MMKV, persistence | | Structure | references/project-structure.md | Project setup, architecture |

Constraints

MUST DO

• Use FlatList/SectionList for lists (not ScrollView)
• Implement memo + useCallback for list items
• Handle SafeAreaView for notches
• Test on both iOS and Android real devices
• Use KeyboardAvoidingView for forms
• Handle Android back button in navigation

MUST NOT DO

• Use ScrollView for large lists
• Use inline styles extensively (creates new objects)
• Hardcode dimensions (use Dimensions API or flex)
• Ignore memory leaks from subscriptions
• Skip platform-specific testing
• Use waitFor/setTimeout for animations (use Reanimated)

Code Examples

Optimized FlatList with memo + useCallback

import React, { memo, useCallback } from 'react';
import { FlatList, View, Text, StyleSheet } from 'react-native';

type Item = { id: string; title: string };

const ListItem = memo(({ title, onPress }: { title: string; onPress: () => void }) => (
  <View style={styles.item}>
    <Text onPress={onPress}>{title}</Text>
  </View>
));

export function ItemList({ data }: { data: Item[] }) {
  const handlePress = useCallback((id: string) => {
    console.log('pressed', id);
  }, []);

  const renderItem = useCallback(
    ({ item }: { item: Item }) => (
      <ListItem title={item.title} onPress={() => handlePress(item.id)} />
    ),
    [handlePress]
  );

  return (
    <FlatList
      data={data}
      keyExtractor={(item) => item.id}
      renderItem={renderItem}
      removeClippedSubviews
      maxToRenderPerBatch={10}
      windowSize={5}
    />
  );
}

const styles = StyleSheet.create({
  item: { padding: 16, borderBottomWidth: StyleSheet.hairlineWidth },
});

KeyboardAvoidingView Form

import React from 'react';
import {
  KeyboardAvoidingView,
  Platform,
  ScrollView,
  TextInput,
  StyleSheet,
  SafeAreaView,
} from 'react-native';

export function LoginForm() {
  return (
    <SafeAreaView style={styles.safe}>
      <KeyboardAvoidingView
        style={styles.flex}
        behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
      >
        <ScrollView contentContainerStyle={styles.content} keyboardShouldPersistTaps="handled">
          <TextInput style={styles.input} placeholder="Email" autoCapitalize="none" />
          <TextInput style={styles.input} placeholder="Password" secureTextEntry />
        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  safe: { flex: 1 },
  flex: { flex: 1 },
  content: { padding: 16, gap: 12 },
  input: { borderWidth: 1, borderRadius: 8, padding: 12, fontSize: 16 },
});

Platform-Specific Component

import { Platform, StyleSheet, View, Text } from 'react-native';

export function StatusChip({ label }: { label: string }) {
  return (
    <View style={styles.chip}>
      <Text style={styles.label}>{label}</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  chip: {
    paddingHorizontal: 12,
    paddingVertical: 4,
    borderRadius: 999,
    backgroundColor: '#0a7ea4',
    // Platform-specific shadow
    ...Platform.select({
      ios: { shadowColor: '#000', shadowOffset: { width: 0, height: 2 }, shadowOpacity: 0.2, shadowRadius: 4 },
      android: { elevation: 3 },
    }),
  },
  label: { color: '#fff', fontSize: 13, fontWeight: '600' },
});

Output Format

When implemen