Full-Stack TypeScript Dev — Next.js + Supabase Game Backend

We're launching a daily Bitcoin prediction game. Free to play, streak mechanic, real on-chain jackpot, micro-purchases via Lightning (hosted provider API, no node) You won't be working from vague ideas: there's a working interactive demo covering every screen, state and behaviour (built as a reference, not production code), a professional Figma reskin of it in progress, and a full technical spec: schema, endpoints, game rules, emails, edge cases. You will need to implement the production frontend from the demo + Figma and build the backend from the spec. Shortlisted candidates get a one-page technical summary and the full spec will be provided on contract signing. Stack: Next.js (App Router, TypeScript) on Vercel, Supabase (Postgres, magic-link auth, RLS), Vercel Cron, Resend, Lightning via OpenNode/Speed webhook. No Docker, no queues, no other services. The core of the work: a per-minute price/resolution cron that must be idempotent, game state logic with strict rules, webhook-driven payment crediting, 5 transactional emails, a minimal admin page, PWA installability. Mobile is the primary viewport. Everything runs in the client's accounts and repo from day one. Ideally you've built something like this shape before; auth, scheduled jobs, webhook-driven payments and can show us a live project. Ideal if you work AI-assisted (Claude Code, Cursor or similar); the scope is sized for it. Fixed price contract, looking for delivery in around 21 days. Code lives in our repo from day one, NDA + IP assignment on signing. If this sounds like your kind of build, looking forward to hear from you, please apply with your closest relevant project.