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I will fix python bugs in your fastapi or flask backend
Joao O
About this gig
Is your Python backend returning errors, failing requests, or behaving differently from what you expected?
I will investigate and fix agreed bugs in your FastAPI or Flask application, including validation errors, database queries, JSON responses, and broken endpoint logic. I can also help repair a Python backend built with AI coding tools.
You will receive:
- Updated source code or a pull request
- Relevant regression tests where practical
- A clear explanation of the root cause and changes
- Instructions to verify the result
I have professional experience developing and operating backend services for AI and cybersecurity products. My approach combines careful debugging, readable code, and testing.
Each package covers an agreed list of reproducible issues in one backend service. New features, full rewrites, and deployment work need a separate scope.
Please send the error, expected behavior, and relevant code before ordering so I can confirm the right package.
Get to know Joao O
Joao O
- FromPortugal
- Member sinceApr 2019
Languages
English, Portuguese
I'm João, a software engineer based in Portugal with experience building and operating backend services for AI and cybersecurity products. I develop Python and TypeScript APIs, automate workflows, and set up Docker deployments and CI/CD pipelines. My hands-on work includes Kubernetes, PostgreSQL, Linux, Nginx, and cloud infrastructure. I also use AI coding tools extensively, combined with code review and testing. Whether you need an API, a bug fix, or a deployment setup, I focus on maintainable code, clear communication, and practical documentation.
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FAQ
Can you fix AI-generated code?
Yes. I can investigate and repair Python backend code created with AI tools. This covers the agreed bugs; rebuilding an entire application needs a separate offer.
What counts as one bug?
One specific, reproducible mismatch between expected and actual behavior. For example, an endpoint returns an incorrect response for a valid request. We agree the issue and acceptance criteria before the order.
Can I order if I do not know the root cause?
Yes, but please message me first with the error and reproduction steps. I will check whether the issue fits a fixed-price package or needs a separate diagnostic scope.
Do you add tests?
I add focused regression tests when the issue can be reproduced in an automated test. If an external dependency prevents that, I provide the verification steps and explain the limitation.
What is included in a revision?
A revision adjusts the delivered fix to meet the originally agreed behavior. New bugs, new features, and changed requirements need a separate scope.
Do you use AI coding tools?
I may use AI tools to assist development, and I review and verify the delivered changes. Tell me if your project prohibits AI use or has restrictions on sharing code with external tools.
