Fernando M.

I’m a senior backend engineer with 15+ years of experience working on production systems and APIs. I specialize in debugging and stabilizing Node.js / Express backends, fixing REST API issues, resolving authentication problems, and troubleshooting database queries (PostgreSQL, MongoDB, SQLite). I’m comfortable entering existing codebases quickly, identifying root causes, and delivering clean, practical fixes. My focus is clear communication and efficient resolution — not overengineering. Typical tasks I handle: • 500 errors and unexpected responses • Auth / middleware bugs • Webhook and integration issues • Database performance problems • Deployment and environment issues If you have a specific backend issue, send the error message and relevant code and I’ll confirm scope quickly. Available for short tasks and fast turnaround work.