I will fix nestjs backend bugs, API errors, and performance issues

E
eng_rezayee
E
eng_rezayee
Eng Rezayee
fix nestjs backend bugs, API errors, and performance issues
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fix nestjs backend bugs, API errors, and performance issues

About this gig

Bug-Fixing Description (NestJS / ExpressJS)

If your NestJS or ExpressJS backend is broken, throwing errors, or behaving incorrectly, I will debug and fix the issue efficiently using clean and safe practices.


What I fix:

  • NestJS / ExpressJS runtime & logic errors
  • Broken or failing REST API endpoints
  • Authentication & authorization bugs (JWT / session)
  • Database issues (MySQL, PostgreSQL, MongoDB)
  • Validation, exception handling, and response errors
  • Performance bottlenecks and misconfigurations
  • Deployment-related issues (Docker, VPS, Render, Railway)

What you get:

  • Clean, tested bug fixes
  • Clear explanation of the root cause
  • Updated source code (no hacks)
  • Suggestions to prevent the issue in the future

Why choose me:

  • Backend developer with real debugging experience
  • Fast, honest communication no guessing
  • I fix the problem, not just silence the error

Note:

Please message me before ordering with error logs, screenshots, or repository access.

Bug scope must be reviewed before starting.

  • Programming language

    • TypeScript

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Security
    • Databases
    • Source control

  • Frontend framework

    • React.js
    • Bootstrap
    • Tailwind CSS
    • Other

  • Backend framework

    • Django
    • Laravel
    • Express.js
    • Node.js
    • Other

Get to know Eng Rezayee

Eng Rezayee

Full Stack Developer

5.0(3)
  • FromAfghanistan
  • Member sinceApr 2025
  • Avg. response time1 hour
  • Last delivery1 month

  • Languages

    English, Persian
Full Stack Developer I'm a skilled Full Stack Developer specializing in building scalable and user-friendly web applications using NextJs/ReactJs, NestJs/ExpressJs, MongoDB, and Tailwind CSS. Whether you need a full-stack solution or just help with part of your app, I'm here to deliver clean, efficient, and modern code.

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