Full-Stack Developer Needed to Fix Existing Next.js + FastAPI + OpenAI Application

I’m looking for an experienced Full-Stack Developer to fix and debug an existing application. Tech Stack: * Frontend: Next.js / React * Backend: Python / FastAPI * AI: OpenAI API * REST APIs What you’ll do: * Debug and fix existing frontend/backend issues * Fix OpenAI API integration and related errors * Resolve API communication issues between Next.js and FastAPI * Fix bugs and improve error handling * Ensure the application works reliably end-to-end Requirements: * Strong experience with *Next.js, React, Python, and FastAPI* * Hands-on experience with *OpenAI API integration* * Strong debugging skills * Comfortable working with an existing codebase * Good understanding of APIs, authentication, environment variables, and security This is an *existing application*, not a project from scratch. I need someone who can quickly understand the codebase and identify the root cause of issues. Please share examples of similar *Next.js + FastAPI + OpenAI* projects you have worked on.