I will fix bugs and optimize performance in your mern or pern stack application

Is your Node.js app throwing errors you can't trace? 

Is your API slow, crashing, or returning wrong responses?

I'll find it, fix it, and explain exactly what went wrong.

3+ years building production systems in fintech and e-commerce. I've improved SQL response times by 30%, resolved race conditions, and fixed JWT auth bugs on real client systems.

WHAT I FIX

• Node.js / Express crashes and runtime errors
• REST API bugs wrong responses, 500 errors, broken routes
• JWT and session authentication bugs
• Slow MySQL / PostgreSQL queries
• MongoDB and Mongoose issues
• CORS errors and middleware conflicts
• Sequelize / Knex ORM and N+1 query problems
• React bugs state, rendering, API failures
• Race conditions in booking/inventory systems
• Memory leaks and Node.js bottlenecks

MY PROCESS

1. You describe the bug and share your code
2. I reproduce and trace the root cause
3. I fix with clean, commented changes
4. I deliver with a written explanation

Node.js · Express · React · MySQL · PostgreSQL · MongoDB · JWT · Docker

️Message me before ordering I only accept work I'm confident I can complete.