Full-Stack Developer Needed to Stabilize & Finalize V1 of Existing App

We have developed a web application using a rapid development approach (“vibe coding”) to quickly bring the core product to life. The application is already functional and includes most of the key features, but it is not yet production-ready. We are now looking for an experienced full-stack developer to review the existing codebase, identify issues, fix bugs, improve stability, and help us finalize a clean and reliable Version 1 release. What we need help with: Deep review of existing codebase (frontend + backend) Fixing bugs and inconsistent behaviors Improving performance and stability Cleaning up architecture where needed Ensuring proper error handling and edge cases Preparing the app for production deployment Finalizing a stable v1 release Tech stack (adjust if needed): Node.js backend Sequelize ORM PostgreSQL database React frontend Ideal candidate: Strong experience in production-grade full-stack applications Comfortable working with existing / messy codebases Good debugging and problem-solving skills Experience deploying scalable web applications Ability to think critically and improve architecture where needed Important note: This is not a greenfield project. You will be working on an already built system that needs refinement, stabilization, and production readiness. Opportunity: If the collaboration goes well during this phase, there is a strong opportunity for long-term engagement as we continue building and scaling the platform.