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I will fix python fastapi bugs and backend API errors
Mohammad Usama
About this gig
Having a Python, FastAPI, or backend API issue that is blocking your project?
I fix clearly scoped backend bugs and API errors in existing Python/FastAPI projects.
I can help with:
- FastAPI endpoint errors, including 422/500 responses
- Pydantic validation and request/response issues
- REST API and backend debugging
- CRUD logic and HTTP status problems
- SQLite/database-related bugs
- API integration issues
- AI-generated or vibe-coded backend problems
What you get:
- Root-cause diagnosis
- A focused fix within the agreed scope
- Verification of the affected behavior
- A short explanation of what changed
My process: reproduce > diagnose > fix > test > verify.
I work with Python, FastAPI, Pydantic, SQLite, REST APIs, Swagger/OpenAPI, Git/GitHub, and structured testing.
Please message me before ordering if the issue involves multiple systems, a large codebase, deployment infrastructure, several unrelated bugs, or unclear scope. I can review the problem and recommend the right package or a custom offer.
Get to know Mohammad Usama
Mohammad Usama
AI App and Full Stack Developer
- FromPakistan
- Member sinceMay 2018
Languages
Urdu, English
I build, fix, and improve AI-powered web apps, SaaS products, MVPs, and full-stack applications. I use AI-assisted development workflows and coding agents to turn ideas into working software, troubleshoot broken apps, and integrate APIs or AI features. My hands-on work includes React/FastAPI projects, Android products, backend APIs, multi-agent prototypes, debugging, and testing. I work with Codex, Replit, Lovable, Google AI Studio, Python/FastAPI, React/JavaScript, Git/GitHub, and LLM integrations.
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FAQ
What information do you need before starting?
Please send the error or unexpected behavior, relevant code or repository access, steps to reproduce the issue, and what you expected the application or API to do. Do not send passwords, private API keys, tokens, or other secrets.
What counts as one bug or issue?
One issue is a specific, reproducible problem within a clearly defined part of the backend. Multiple unrelated bugs, major feature work, or architectural changes may require a larger package or custom offer.
Will you need access to my source code?
Usually, yes. I need the relevant code, configuration, logs, or project files required to reproduce and diagnose the problem. Please share only what is necessary and never send passwords or private keys.
Will you test the fix?
Yes. I verify the affected behavior after making the change and confirm the agreed issue is resolved. I also provide a short explanation of what changed.
Can you work with an AI-generated or vibe-coded backend?
Yes. I can review and debug Python or FastAPI code produced with AI coding tools when the problem and project scope are clearly defined.
What is not included in a normal bug-fix package?
Full application development, large architectural rewrites, major deployment work, and multiple unrelated issues are outside a normal bug-fix scope. Message me first if your project may require this.
What if I am not sure which package to choose?
Message me with the problem, error details, and relevant context before ordering. I can help determine whether it fits Basic, Standard, Premium, or needs a custom offer.
