Senior Full-Stack Engineer

We are seeking a senior full-stack engineer to develop and build a conversational AI performance coaching platform for financial traders — and, later, professional sports bettors and prediction market participants. The product has one unusual architectural feature: two distinct AI personas in a single conversation interface. We want to hear from you if: - you have shipped at least one production LLM product — real users, streaming responses, prompt versioning, token-cost decisions, failure handling. - You have 4+ years of full-stack experience with strong React/Next.js and Postgres. Supabase and Stripe experience specifically is a big plus. - You work well async with high autonomy: daily Loom/Slack updates, weekly calls, no micromanagement.