Experienced Full-Stack Developer Needed to Finalize and Stabilize SaaS Product – Neirom

I’m looking for an experienced full-stack developer to help me finish and professionally stabilize an existing SaaS product called Neirom. Neirom is already largely built and live. This is not a project starting from zero, and I do not want a complete rebuild. I need someone who can review the existing codebase, understand what is already working, fix the remaining problems, improve performance and reliability, and bring the product to a professional production-ready standard. Current Stack / Integrations Include: - React / TypeScript - Supabase / PostgreSQL - Lovable - Anthropic AI API - Paddle payments - Resend email - Shopify OAuth, product sync, and webhooks - Etsy OAuth/API integration - GitHub What I Need: 1. Full technical audit of the existing application. 2. Fix bugs and broken flows. 3. Improve speed, stability, responsiveness, and code quality where necessary. 4. Review authentication, database permissions, and security. 5. Test signup/login, plans, AI analysis, and billing end-to-end. 6. Finish and test the Shopify integration for production use. 7. Review the Etsy API implementation and ensure compliance with Etsy’s current API requirements. 8. Help prepare the app for Etsy Commercial Access review (if permitted by Etsy). 9. Help prepare the Shopify app for public distribution/review. 10. Verify webhooks, synchronization, monitoring, and scheduled jobs. 11. Test mobile and desktop UX thoroughly. 12. Fix only what is necessary — no unnecessary redesign or new features added unnecessarily! Proposal Requirements: Please include: 1. What you believe still needs to be completed after reviewing the project structure (based on provided details). 2. How long it would realistically take to finalize the product professionally? 3. Your fixed price to bring Neirom to a launch-ready state (after understanding its current status). 4. Your experience with Shopify apps, Supabase, OAuth/API integrations (specific examples are appreciated). 5. Whether you have previously helped an app through Shopify App Review or Etsy API approval processes? Important Notes: Neirom already has substantial functionality built in; I am looking for someone who can work with what is already there rather than rebuilding everything from scratch unnecessarily! Efficiency matters as my budget is limited! Please start your proposal with “NEIROM” so I know you’ve read this description carefully! Also briefly explain how you would approach stabilizing an existing SaaS like this.