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Master end-to-end testing with Playwright and Cypress. Build reliable test suites that catch bugs and enable fast deployment.

Master Git rebasing, cherry-picking, bisect, worktrees, and reflog. Maintain clean history and recover from any mistake.

Comprehensive testing with Jest, Vitest, and Testing Library. Unit tests, integration tests, mocking, and TDD for JS/TS projects.

Build production React apps with Next.js App Router, server components, data fetching, routing, and performance optimization.

Browser automation with Playwright. Web scraping, testing, screenshots, PDF generation, and multi-browser automation scripts.

Create distributable Python packages with pyproject.toml, proper structure, and PyPI publishing workflows.

Implement comprehensive testing strategies with pytest, fixtures, mocking, and test-driven development for robust Python applications.

Upgrade React apps systematically. Migrate class components to hooks, adopt React 18 features, and modernize legacy patterns.

Master machine learning with scikit-learn. Classification, regression, clustering, preprocessing, model evaluation, and production …

System design specialist for modern tech stacks. Architecture diagrams, design patterns, tech stack decisions, and dependency analysis for …

Master SQL query optimization, indexing strategies, and EXPLAIN analysis. Dramatically improve database performance and eliminate slow …

Build full-stack apps with Supabase. PostgreSQL, authentication, storage, real-time subscriptions, and edge functions.

Identify and prevent common testing mistakes. Stop testing mock behavior, avoid production pollution, and write meaningful tests.

Master uv, the extremely fast Rust-based Python package installer. 10-100x faster than pip for modern Python project management.

Build Retrieval-Augmented Generation systems that ground LLM responses in external knowledge sources. Reduce hallucinations and enable …

Master Python asyncio, concurrent programming, and async/await patterns for high-performance applications.

Master utility-first CSS with TailwindCSS. Responsive design, dark mode, custom themes, and component patterns for rapid UI development.

Expert ReactJS, NextJS, and TypeScript development with performance optimization, bundle analysis, and modern frontend best practices.

Build accessible UI components with shadcn/ui. Beautifully designed components built on Radix UI and styled with Tailwind CSS.