Full Stack Developer for AI Image API

We have a fully designed, client-approved HTML/CSS/JS color season analysis web app. The prototype is complete — we need a developer to build the backend that makes it a sellable digital product. You are not designing anything. You are wiring up the backend. DELIVERABLE 1 — AI Shirt Color Replacement Users upload a headshot in a white t-shirt. When they select a color swatch, the app uses AI to swap the shirt color so they can see themselves in each color being compared. - Integrate an image AI API (OpenAI GPT-4o, Replicate, or Fashn.ai) - All API calls handled server-side — API keys never exposed in the browser - Graceful error handling if the API fails DELIVERABLE 2 — Token-Gated Access System The product sells through Wix. After purchase, customers automatically receive a unique access link — no manual work from the business owner. - Wix purchase triggers a webhook to your backend - Backend generates a unique token and stores it in a database - Customer receives an automated email with their unique URL - Token expires after 7 days and is single-use - Expired or used links show a branded error page - Simple admin interface for the business owner to reset or generate tokens manually — no coding required DELIVERABLE 3 — Hosting and Handoff - Deploy to Vercel or Netlify on a custom subdomain - DNS instructions for our Wix domain - Written handoff doc — how the token system works, how to manage tokens, basic maintenance notes