Backend Developer — Node.js, Supabase, Stripe & Railway Deployment (Fixed Scope)

I need an experienced Node.js/Express developer to deploy and integrate an already-written backend for TKNMINE, an AI-powered professional education and credentialing platform for digital finance and blockchain tokenization. The frontend (35 HTML files) is complete. All 5 backend scripts are already fully written and hosted in a private GitHub repo — this is a deployment and integration project, not a from-scratch build. What's already done: Complete frontend (35 production HTML files) 5 backend scripts, fully written: Express server with all API routes, Stripe webhooks, health check Regulatory knowledge preloader for an AI assistant ("Stewart") AI token-cost reduction utility Compliance logging system (EU AI Act Article 12/14), with ready-to-run Supabase SQL migration included Stripe payment routing, upgrade detection, churn signal logic What I need you to do: Deploy the backend to Railway (Node.js 18+) Set up Supabase (Postgres + auth) and run the provided migration SQL Set up Upstash Redis for caching Connect the Anthropic API to power the AI chat assistant, wiring in the two provided utility scripts Connect Stripe (live mode, account provided) and test webhook handling for subscriptions Implement a public credential verification endpoint Deploy to a live Railway URL, confirm health check works Provide brief redeployment documentation One 30-minute handoff call Explicitly out of scope: NFT minting smart contracts, the five-agent discovery system, any frontend design changes, and anything related to our separate newsletter/marketing site (not part of this repo or contract). To apply, please include: A link to one project you've built or contributed to involving Supabase and Stripe together One sentence on your specific experience with Stripe webhook testing Confirmation you can work within the stated budget I have a detailed Scope of Work document ready to share with shortlisted candidates, including a clear Definition of Done.