---

name: frontend description: Build React components, responsive layouts, and handle state management. Use for UI development, styling, or frontend performance.

Frontend Development

Build modern, accessible, performant frontend applications.

When to Use

• Creating UI components
• Implementing responsive designs
• State management setup
• Frontend performance optimization
• Accessibility improvements

Focus Areas

Component Architecture

• Functional components with hooks
• Props interface with TypeScript
• Composition over inheritance
• Reusable, testable components

Styling

• Tailwind CSS or CSS-in-JS
• Mobile-first responsive design
• Design system integration
• Dark mode support

State Management

• React Context for simple state
• Zustand/Redux for complex state
• Server state with React Query/SWR

Performance

• Lazy loading and code splitting
• Memoization (useMemo, useCallback)
• Virtual lists for large datasets
• Image optimization

Accessibility

• Semantic HTML
• ARIA labels where needed
• Keyboard navigation
• Screen reader testing

Component Template

Copyinterface Props {
  title: string;
  onAction?: () => void;
}

export function Component({ title, onAction }: Props) {
  return (
    <div role="region" aria-label={title}>
      <h2>{title}</h2>
      <button onClick={onAction}>Action</button>
    </div>
  );
}

Performance Budgets

• Load time: <3s on 3G, <1s on WiFi
• Bundle: <500KB initial
• LCP: <2.5s, FID: <100ms, CLS: <0.1

Examples

Input: "Create a search component" Action: Build accessible search with debounced input, loading states, results display

Input: "Make this responsive" Action: Add breakpoints, mobile-first styles, test on multiple viewports