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I will audit debug and fix python backend and rest apis
Darius Ceponas
About this gig
Is your Python application crashing, REST API failing, or backend behaving unexpectedly?
I investigate, debug, and fix backend issues with a focus on root causes, reliability, and maintainable solutions.
What I can help with:
- Python and FastAPI debugging
- REST API errors and failed integrations
- PostgreSQL and SQL database issues
- Backend performance bottlenecks
- Authentication and authorization bugs
- Docker and Linux application issues
- Code quality and architecture reviews
- Error handling, logging, and testing
My approach:
- Investigate the issue and identify its root cause.
- Review the relevant code, logs, and dependencies.
- Implement fixes within the agreed scope.
- Test the changes and document the results.
Packages:
Basic Investigation and root-cause report.
Standard Diagnosis and fix of one scoped issue.
Premium Backend audit and up to three agreed fixes.
My projects include Mining Scan, SMOOZYPOOL, Raposa Aval, and INTESTA.
Please message me before ordering production-critical or complex work.
Get to know Darius Ceponas
Darius Ceponas
AI Automation and Backend Systems Architect
- FromSpain
- Member sinceMay 2026
Languages
Russian, Lithuanian, English, Spanish
I build practical AI automations, Python backends and connected digital products. My work includes AI-agent workflows, human approval paths, API integrations, FastAPI services, data pipelines, dashboards and technical architecture reviews. I also improve existing websites and product interfaces, and create original YouTube thumbnails and AI-assisted visuals. I start with the system you already have, define a realistic scope, then deliver tested work with clear handover notes. Tell me what you need to automate, connect, audit, build or present, and I will suggest a concrete first step.
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FAQ
Can you fix bugs in an existing Python application?
Yes. I can investigate and fix issues in existing Python applications, FastAPI services, and REST API integrations within the agreed scope.
What is included in the Basic package?
Basic includes investigation of one issue and a root-cause report with recommended next steps. Code fixes are not included.
Do you work with databases and API integrations?
Yes. I work with PostgreSQL, SQL queries, REST APIs, authentication, webhooks, and backend integrations.
Will you test the fixes before delivery?
Yes. Standard and Premium include relevant testing of implemented fixes. The tests performed and any remaining limitations will be documented.
Do you need access to my server or source code?
I usually need the relevant code, logs, error details, or a reproducible test environment. Access is agreed in advance using least-privilege permissions. Please do not send passwords or API keys.
