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I will debug and fix your python fastapi or postgresql backend
JozsefDev
About this gig
Is your FastAPI app throwing 500 errors, failing on database queries or breaking after a change? I will find the root cause and fix it.
Typical problems I fix:
- 500 / 422 errors and broken endpoints
- Request validation and response model issues
- PostgreSQL errors, wrong query results, slow queries
- Login and authentication problems
- Failing third-party API or payment integrations
- CORS, environment and configuration issues
- Failing or missing tests for the affected code
How I work:
- You send the error, logs and steps to reproduce
- I confirm the scope and the right package before starting
- I reproduce the bug, fix the cause and verify the fix
- You get the fixed code plus a short note on what changed and why
Real experience: I built and maintain a production FastAPI + PostgreSQL webshop with Barion payments, customer accounts and an admin panel for a real client.
Each package covers one clearly defined issue. For new features or complete backends, please message me first so we can agree on the scope.
What I need: the repository or relevant files, error logs or screenshots, and how to run the project.
Get to know JozsefDev
JozsefDev
Python Backend Developer, FastAPI, PostgreSQL and API Integrations
- FromHungary
- Member sinceMay 2026
Languages
English
I build reliable Python backends, REST APIs and integrations with FastAPI and PostgreSQL. I can help you debug existing code, add endpoints, connect databases or third-party services, improve tests, and prepare a backend for deployment.
Recent work includes a production webshop and digital storybook platform for a real client, plus local-first desktop tools with structured workflows and automated test coverage.
I focus on clear scope, maintainable code, practical testing and honest communication. Send me your problem and I will first confirm the safest approach and the right package.
My Portfolio
FAQ
What technologies do you work with?
Python, FastAPI, PostgreSQL, SQLite, REST APIs, Git, testing, debugging, and backend development tools.
Do you work on existing projects?
Yes. I can investigate bugs, improve existing code, add new features, or help optimize backend systems.
Do you provide frontend development?
My primary focus is backend development. I can work with projects that include frontend components, but backend systems and APIs are my main expertise.
