Full-Stack Dev to Build AI SaaS MVP (Etsy/eBay Listing Automation Tool), Next.js/Node

I'm a solo founder building an AI-powered SaaS product. I need a full-stack developer to build the MVP end-to-end. Do not apply if you have not integrated with either the Etsy API v3 or the eBay REST API before. Applications without specific examples of relevant prior work WILL NOT be reviewed. WHAT WE'RE BUILDING A tool that automates product listing creation and management across Etsy and eBay for dropshipping sellers. Core flow: 1. User connects their Etsy/eBay seller account (OAuth) 2. User provides a source product (URL, image, or basic details) 3. Tool generates optimized listing content (title, description, tags) via LLM, pulls/processes product images 4. User reviews/edits, then tool publishes or updates the listing via the marketplace API 5. Basic sync: track listing status, handle re-publish on edits TECH STACK (open to your recommendation, but this is our default) - Frontend: Next.js + Tailwind - Backend: Node.js or Python (FastAPI) - DB: Postgres (Supabase is fine) - Auth: Clerk/Supabase Auth (for our users) + OAuth (for Etsy/eBay seller accounts) - AI: Anthropic or OpenAI API - Hosting: Vercel + Railway/Render SCOPE OF THIS ENGAGEMENT - User auth + billing (Stripe, subscription-based) - Etsy API and eBay API integration (OAuth, listing CRUD, rate-limit handling) - LLM pipeline for listing content generation - Basic dashboard: connect accounts, create/manage listings, view sync status - Deployed, working product, not just local dev NOT IN SCOPE (for now) - Additional marketplaces beyond Etsy/eBay - Inventory/order management beyond listing sync - Mobile app WHAT I NEED FROM YOU - Architecture recommendation before we start (brief written plan) - Weekly async updates (Loom or written), I don't need daily calls - Clean, documented code I can hand to another dev later if needed - Deployed staging environment I can test throughout, not just at the end BUDGET & TIMELINE Fixed price: $3,500 for MVP, paid in milestones. Target timeline: 4–6 weeks for a working MVP. Strong potential for ongoing/future work if this goes well. TO APPLY Please answer the screening questions below in your proposal. Generic/copy-paste proposals will not be considered.