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Fiverr Pro
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$
USD
I will debug and fix your python fastapi backend or rest API
Ivan
About this gig
API returning 500? Authentication broken? Everything works locally but fails in production?
I'm a Python backend developer expert in FastAPI, Flask, REST APIs, PostgreSQL, Redis, WebSockets and Docker.
I can debug and fix:
- FastAPI and Flask bugs
- REST API errors
- Authentication and authorization
- PostgreSQL / SQLAlchemy issues
- Async Python problems
- WebSocket issues
- Third-party API integrations
- CORS and frontend/backend communication
- Redis and caching issues
- Docker and deployment errors
- Slow API endpoints
- Broken business logic
- Production bugs
I focus on finding the root cause, not just hiding the error.
Send me the error, logs or a quick explanation of what's happening.
Get to know Ivan
Ivan
Senior Backend and AI Engineer
- FromUkraine
- Member sinceJun 2021
- Last delivery1 year
Languages
English, Ukrainian, Russian
Hey there! I'm Ivan, a Senior Backend Engineer & AI Integrator with over 6 years of experience. I specialize in building robust server-side architectures and automating business processes using cutting-edge AI. I don't just write code - I build scalable solutions and advanced AI automations that save time and optimize your workflows. My core expertise includes Python, AWS, and Kubernetes. I also develop Custom AI Agents, RAG chatbots and specialize in Web3. From fast API bug fixes to deploying a complete SaaS backend, I deliver clean code.
Send me a message to discuss your project!
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FAQ
Do I need to message you before ordering?
Not necessarily. If you have one small and clearly defined issue, you can order directly. For larger projects, multiple bugs or anything where the scope isn't obvious, send me a message first. A few minutes of clarification usually prevents both of us from wasting time later.
I don't know what's actually broken. Can you still help?
Yes. You don't need to diagnose the problem before contacting me - that's part of my job. Send me what you're seeing, what you expected to happen and any errors or screenshots you have.
Can you work with code written by another developer?
Yes. A large part of backend work involves existing codebases. I can also work with AI-generated projects from Lovable, Bolt, Cursor, Replit and similar tools.
My exact technology isn't listed. Can you still work with it?
Quite possibly. I list the technologies I use most often, but many backend frameworks, SQL databases, cloud platforms and APIs work on the same underlying principles. Send me your stack and I'll tell you directly whether it's something I can take on.
Can you deploy the project too?
Yes. Depending on the project, I can help with Docker, AWS, VPS deployments and other cloud platforms. If deployment is a significant part of the work, we'll include it in the scope before starting.
Can you integrate third-party APIs?
Yes. I regularly work with external APIs, AI services, payment systems, databases, webhooks and other integrations.
Do you work on long-term projects?
Yes. A small Fiverr order can stay a small order, but if you need continued development after that, I'm open to longer-term work as well.
What if my project doesn't fit any package?
That's normal. Packages are there to make common tasks easy to buy. For larger or unusual projects, send me the requirements and I'll create a custom offer based on the actual work involved.
Will you explain what you changed?
Yes. For bug fixes, I'll tell you what caused the problem and what was changed. For larger projects, I can also provide technical notes or documentation where it makes sense.
Is my code and project information confidential?
Yes. I treat client code, credentials, business logic and project information as confidential and only request access that is actually needed for the work.
