web application developer

Looking for an experienced Full-Stack Developer to help finalize an almost-completed web application and make it fully launch-ready and deployment-ready. The project is already largely built and functional. I am not looking for someone to start from scratch. The main work will involve reviewing the existing codebase, checking that all frontend and backend components are properly wired together, fixing any broken flows, completing unfinished features, improving security, testing the application thoroughly, and preparing it for production launch. The developer should be comfortable with: * Reviewing an existing full-stack codebase * Checking frontend-to-backend wiring * Verifying API integrations * Fixing incomplete or broken functionality * Completing remaining features * Improving authentication and authorization * Adding security hardening * Checking role-based access control * Reviewing database relationships and data separation * Fixing production bugs * Improving performance and loading speed * Validating payment and third-party API integrations * Checking environment variables and deployment configuration * Testing all user flows end-to-end * Fixing mobile, tablet, and desktop responsiveness issues * Reviewing GitHub structure and commits * Making sure everything is properly pushed and version-controlled * Preparing the application for production deployment * Deploying and verifying the live production build * Performing final launch-readiness testing Preferred technical experience: * React / Vite * Node.js / Express * PostgreSQL * REST APIs * Authentication / OAuth * Stripe or similar payment integrations * Netlify or similar deployment platforms * Git / GitHub * Third-party API integrations * AI API integrations * Database security * Responsive frontend development This is primarily a finishing, auditing, integration, security, and production-readiness project. The application is approximately near completion, so I need someone who can quickly understand what is already built, identify what is missing or incorrectly connected, and take ownership of getting the complete system ready for a real production launch. The expected workflow is: Existing Codebase → Audit → Fix Wiring → Complete Features → Security Review → Testing → Bug Fixes → Production Configuration → Deployment → Final Launch Validation I am looking for someone who can work independently, identify problems without needing every issue pointed out manually, and make sure the application is stable, secure, functional, and ready for users. When applying, please share: * Full-stack development experience * GitHub or portfolio * Similar projects you have finalized or launched * Your main tech stack * Experience debugging existing production applications * Experience with security and production-readiness reviews * Availability * Hourly rate or project-based pricing There may also be ongoing development work after the launch for the right freelancer.