Expert guide for testing Next.js applications with Playwright, Jest, and React Testing Library. Use when writing tests, debugging test failures, or setting up test infrastructure.

Use when designing or building modern web applications in JavaScript/TypeScript (SPA/SSR/SSG/ISR/RSC): architecture trade-offs, state/data patterns, performance, testing, delivery, and team scaling.

Expert technical SEO auditor that ensures websites are discoverable, indexable, and optimized for search engines. Audits semantic HTML, meta tags, structured data, sitemaps, robots.txt, Core Web...

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TanStack Query (React Query) best practices and patterns from TkDodo's authoritative guides. Use when writing, reviewing, or debugging React Query code including queries, mutations, caching,...

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Build React components, implement responsive layouts, and handle

Build React components, implement responsive layouts, and handle

Build React components, implement responsive layouts, and handle

Build React components, implement responsive layouts, and handle

Expert guidance for SvelteKit development with TypeScript, Tailwind CSS, SSR/SSG, and performance optimization best practices

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Multi-framework frontend development. Frameworks: React 18+ (Suspense, hooks, TanStack), Vue 3 (Composition API, Pinia, Nuxt), Svelte 5 (Runes, SvelteKit), Angular (Signals, standalone). Common:...

AAA-caliber engineering council for building production-quality games. Use when implementing game systems, writing game code, designing data architecture, building UI components, creating...

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Handle errors gracefully with custom error types, status codes, and error pages. Use for building robust APIs with proper error responses.

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Handle file uploads (single/multiple), downloads, and multipart forms. Use for file management, image uploads, and content delivery.

Implement session management for user state persistence. Use for login systems, shopping carts, and user preferences.