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I will fix your fastapi supabase and ai backend
Roshan L
About this gig
Is your FastAPI, Supabase, PostgreSQL, or AI-powered backend throwing errors, failing authentication, or behaving unpredictably?
I will diagnose and fix backend issues in existing applications, including:
- Broken FastAPI endpoints
- Supabase authentication and RLS errors
- PostgreSQL and database problems
- OpenAI, Anthropic, or Gemini integration bugs
- JWT, permissions, and authorization issues
- WebSocket and real-time connection errors
- Deployment, configuration, and environment problems
- Poor error handling and unstable backend logic
- I am a full-stack and AI backend engineer with experience building production FastAPI systems, AI agents, financial platforms, real-time applications, and secure PostgreSQL architectures.
You will receive:
- Root-cause investigation
- Clean and maintainable code fixes
- Testing of the repaired functionality
- Clear documentation of what was change
- Reliable communication throughout the project
One issue means one clearly reproducible problem with one root cause. New features, major rewrites, or full application development may require a custom offer.
Get to know Roshan L
Roshan L
- FromUnited States
- Member sinceAug 2020
- Avg. response time11 hours
Languages
English, Hindi, Nepali
I’m a full-stack and AI backend engineer helping startups turn ideas and unstable prototypes into reliable, production-ready products. As a founding engineer at Kairos, I built AI backtesting workflows, LangGraph agents, multi-model integrations, and secure PostgreSQL systems supporting 100+ simulations. I’ve also developed FastAPI and WebSocket systems for Citi, shipped SwiftUI and Firebase apps, and built open-source tools with 9,500+ PyPI downloads and 160+ GitHub stars.
FAQ
What do you need before starting?
Please provide the source code or repository, error messages, logs, reproduction steps, expected behavior, technology stack, and deployment details.
Can you fix Supabase authentication and RLS policies?
Yes. I can diagnose Supabase authentication, session handling, authorization, database permissions, and row-level security issues.
Can you fix OpenAI, Anthropic, or Gemini integrations?
Yes. I can repair model API calls, streaming, structured outputs, tool calling, retries, timeouts, provider configuration, and error handling.
Can you deploy the fixed backend?
Yes. Deployment assistance is available through the Premium package or as an additional service for platforms such as AWS, DigitalOcean, Railway, Render, or similar providers.
Do you build new features or complete applications?
Yes, but new features, major rewrites, and complete applications require a custom offer after I review the requirements.
What happens if the problem is larger than expected?
I will explain what I discover before expanding the scope. Additional issues or major architectural problems will require your approval and may need a custom offer.
