Full Stack Developer for AI SaaS App

Job Description I'm building a SaaS product and looking for a developer who can own the build end to end, not just execute a spec. The idea: a tool for freelancers and small agencies to manage client proposals and follow-ups — you connect your inbox, the app tracks open proposals, drafts AI-suggested follow-up messages based on client replies (or silence), and gives a simple dashboard showing win rate, response times, and where deals are stalling. Core AI feature is proposal/follow-up drafting using the OpenAI or Claude API, trained loosely on the user's own past writing style. I want someone who's actually shipped SaaS products before, ideally with AI features baked in, not just a landing page with a chatbot bolted on. You should be comfortable making architecture calls yourself and pushing back if something I'm asking for doesn't make sense technically. Rough stack I'm expecting: React/Next.js frontend, Node.js backend, Postgres or Supabase for the database and auth, deployed on Vercel or AWS. Open to your input if you'd approach it differently — especially on how to handle email integration (Gmail API vs IMAP) and how to structure the AI prompt/context per user. This starts as an MVP: auth, inbox connection, proposal tracking, and the AI drafting feature. If it goes well I'd want the same person to keep iterating on it long term rather than handing it off to someone new. If you're interested, send over 1-2 SaaS products you've built (live links if possible), a quick note on how you'd approach the email integration and AI piece, and your availability for a call this week