I will fix bugs in your fastapi, python or react web app

M
mustafiz_em0n
M
mustafiz_em0n
Mostafijur R.
fix bugs in your fastapi, python or react web app
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fix bugs in your fastapi, python or react web app

About this gig

Is your FastAPI, Python or React app throwing errors, returning wrong data, or just not working? I will find the root cause and fix it properly, not just hide the symptom.


I can help with:

  • FastAPI errors: 422 validation errors, 500 errors, broken endpoints, async issues
  • PostgreSQL and SQLAlchemy problems: failing queries, migrations, slow queries
  • React and TypeScript bugs: broken state, API calls not working, type errors
  • CORS, authentication (JWT) and environment or deployment issues
  • Docker containers that will not start or connect

How it works:

  1. You share the code (GitHub repo or zip) and describe the bug and how to reproduce it.
  2. I reproduce it, find the cause and fix it.
  3. You get the fixed code plus a short note explaining what was wrong and how to avoid it.

I work full-time as a full-stack engineer on this exact stack. Please message me before ordering so I can look at the problem and confirm the right package.

  • Programming language

    • Python

  • Expertise

    • Debugging
    • Performance
    • Databases
    • Testing procedures

  • Frontend framework

    • React.js

  • Backend framework

    • FastAPI

Get to know Mostafijur R.

Mostafijur R.

Full Stack Developer for FastAPI, React and PostgreSQL

  • FromBangladesh
  • Member sinceOct 2025
  • Avg. response time1 hour

  • Languages

    Bengali, English
I am a full-stack developer who builds web apps end to end: Python/FastAPI backends with PostgreSQL, and React + TypeScript frontends. I work full-time on this stack and have built and deployed my own full-stack apps from scratch. I can build REST APIs, fix bugs or add features to an existing app, and Dockerize and deploy it. I ask questions first so we agree on what done means, share small working updates, and write code the next developer can read. I am also pursuing an MSc in Computer Science and Engineering at East West University.

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