Gavin E.

Production-Ready Backend APIs & AI Code Fixes | Python, TypeScript, Go

I build production-ready backend systems and fix broken AI-generated code. If ChatGPT, Claude, or Cursor wrote your backend and it's not working in production - I make it work. Every deliverable passes a 5-gate automated validation pipeline (functional correctness, security hardening, resource limits, performance, stability) before you receive it. Published methodology on Github. WHAT I DO: → Fix & harden AI-generated code - I audit what your AI tools produced, identify every issue, and deliver surgical fixes that don't break existing functionality → Backend APIs from spec - REST APIs with auth, validation, rate limiting, error handling, and docs. Complete systems in 2-5 days, not 2-4 weeks → Modify & extend existing codebases - Add features, refactor modules, or modernize your stack. I work within your existing architecture, not against it → Data processing & automation - Validation pipelines, webhook handlers, background jobs, third-party API integrations LANGUAGES: Python (FastAPI/Flask) · TypeScript/Node · React · Go · Rust · C++ DATABASES: PostgreSQL · MySQL · MongoDB · Redis INFRA: AWS · Fly · Docker · Git EVERY PROJECT INCLUDES: - Production-ready source code with tests - API documentation (OpenAPI/Swagger) - Deployment scripts - 30-day bug fix guarantee FIXED-PRICE PACKAGES: - Code audit + fix (AI-generated or legacy): $300-800 - API (3-5 endpoints): $500 / 3 days - API (10-15 endpoints): $1,200 / 5 days - Full system (20+ endpoints): $2,500 / 7 days I reply within 4 hours and deliver ahead of schedule. Send me your requirements or your broken codebase - I'll quote within hours.