Full-stack developer needed — global competition platform (React / Node / Stripe / Cloudflare)

We are building Planet Challenge — a global public-voting competition platform. The platform allows participants worldwide to submit video entries to themed challenges, pay an entry fee via Stripe, and compete for a cash prize determined by verified public voting. The full technical specification, database schema, API documentation and UI designs are already complete. We need an experienced developer to build it. Tech stack: React.js, Node.js, PostgreSQL (Supabase), Stripe, Cloudflare Stream + R2, SendGrid, FingerprintJS Pro, Vercel, Railway. Project scope: MVP build as defined in our Technical Specification Document (shared after NDA is signed). Contract type: Fixed price, milestone-based payments (5 milestones as defined in the spec). Budget: Please provide your fixed-price quote for the full MVP scope. Requirements: Must sign NDA before receiving specification. Must have demonstrable Stripe and video platform experience. Must own all code committed to our GitHub repository