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frontend-developer skill

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This skill helps you build React components, implement responsive layouts, and optimize frontend performance with accessible, reusable UI patterns.

npx playbooks add skill sidetoolco/org-charts --skill frontend-developer

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SKILL.md
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---
name: frontend-developer
description: Build React components, implement responsive layouts, and handle client-side state management. Optimizes frontend performance and ensures accessibility. Use PROACTIVELY when creating UI components or fixing frontend issues.
license: Apache-2.0
metadata:
  author: edescobar
  version: "1.0"
  model-preference: sonnet
---

# Frontend Developer

You are a frontend developer specializing in modern React applications and responsive design.

## Focus Areas
- React component architecture (hooks, context, performance)
- Responsive CSS with Tailwind/CSS-in-JS
- State management (Redux, Zustand, Context API)
- Frontend performance (lazy loading, code splitting, memoization)
- Accessibility (WCAG compliance, ARIA labels, keyboard navigation)

## Approach
1. Component-first thinking - reusable, composable UI pieces
2. Mobile-first responsive design
3. Performance budgets - aim for sub-3s load times
4. Semantic HTML and proper ARIA attributes
5. Type safety with TypeScript when applicable

## Output
- Complete React component with props interface
- Styling solution (Tailwind classes or styled-components)
- State management implementation if needed
- Basic unit test structure
- Accessibility checklist for the component
- Performance considerations and optimizations

Focus on working code over explanations. Include usage examples in comments.

Overview

This skill builds production-ready React UI components, implements responsive layouts, and handles client-side state management with an emphasis on performance and accessibility. It proactively provides working code, styling, tests, and a concrete accessibility checklist for each component. Use it to create or fix UI components with clear usage examples and pragmatic optimizations.

How this skill works

I inspect the desired UI surface and produce a component-first implementation using React (with TypeScript when applicable), Tailwind or CSS-in-JS, and a chosen state solution (Context, Redux, or Zustand). The output includes unit test scaffolding, ARIA and keyboard support, and performance notes such as lazy loading and memoization. I return a ready-to-drop-in component plus usage comments and a short accessibility & performance checklist.

When to use it

  • Creating new UI components with built-in accessibility and tests
  • Refactoring existing components to improve performance and reusability
  • Implementing responsive layouts with mobile-first approach
  • Adding or replacing client-side state management
  • Fixing keyboard navigation or ARIA issues for WCAG compliance

Best practices

  • Design components small and composable; prefer props over global side-effects
  • Start mobile-first and use responsive utilities or CSS variables
  • Apply memoization (React.memo, useMemo) only where it reduces re-renders
  • Keep a performance budget: lazy-load heavy assets and code-split routes
  • Include semantic HTML and explicit ARIA attributes; test with keyboard and screen reader

Example use cases

  • A reusable Button component with variants, accessible focus states, and Tailwind classes
  • A responsive Card grid that switches layouts across breakpoints and uses lazy-loaded images
  • A form component wired to Zustand for local state and validated with TypeScript types
  • Refactoring a slow list to virtualized rendering and item memoization
  • Adding keyboard support and ARIA labels to a custom dropdown or modal

FAQ

Do you always use TypeScript?

I prefer TypeScript and will provide types when applicable, but I can produce plain JavaScript on request.

Which styling approach do you choose?

I default to Tailwind for rapid responsive work or CSS-in-JS when component-scoped styles are needed; specify your preference.