React Native

What I do

• Build cross-platform mobile apps with React Native
• Develop using JavaScript/TypeScript with React patterns
• Implement native modules and bridges
• Manage React Native state and navigation
• Optimize app performance
• Work with Expo for rapid development
• Handle platform-specific code

When to use me

Use me when:

• Building mobile apps with React expertise
• Need to share code between web and mobile
• Rapid prototyping required
• Medium-complexity apps
• Teams familiar with JavaScript/React
• Want native performance with JS developer experience

Key Concepts

React Native Architecture

React Native uses a bridge to communicate between JavaScript and native components:

┌─────────────────┐      ┌─────────────────┐      ┌─────────────────┐
│   JavaScript   │ ──── │     Bridge      │ ──── │  Native (iOS)  │
│     Thread     │      │   (Async Msg)   │      │    Thread       │
└─────────────────┘      └─────────────────┘      └─────────────────┘

React Native Components

import React, { useState } from 'react';
import { View, Text, Button, FlatList, StyleSheet } from 'react-native';

const ItemList: React.FC = () => {
  const [items, setItems] = useState<string[]>([]);

  const addItem = () => {
    setItems([...items, `Item ${items.length + 1}`]);
  };

  return (
    <View style={styles.container}>
      <FlatList
        data={items}
        keyExtractor={(item, index) => index.toString()}
        renderItem={({ item }) => (
          <Text style={styles.item}>{item}</Text>
        )}
      />
      <Button title="Add Item" />
    </View>
  );
};

const styles = StyleSheet.create({
  container: { flex: 1, padding: 16 },
  item: { padding: 12, fontSize: 16 }
});

State Management

• useState/useReducer: Local state
• Context: Shared state
• Redux/Zustand: Global state
• React Query: Server state

Navigation

• React Navigation: Most popular, customizable
• React Native Navigation: Native performance

Expo

Managed workflow with pre-built APIs:

• Camera, Location, Notifications
• Push notifications
• Asset loading
• Over-the-air updates