I will diagnose and fix bugs in your existing Node.js or React codebase, or review your code for quality, security, and performance issues.
What I can do: fixing broken API endpoints, resolving auth issues (JWT, sessions, cookies), debugging database query issues, identifying security vulnerabilities (XSS, CSRF, injection), improving error handling, and refactoring messy code into a clean, maintainable structure.
I use structured logging, test-driven reproduction cases, and coverage reports to isolate and fix issues properly — not just patch symptoms.
Stack coverage: Node.js, Express.js, NestJS, React, Next.js, PostgreSQL, MongoDB, TypeScript.