Custom MVP AI Chat Runtime Development

I need a developer to build a custom MVP AI chat runtime. This is not a generic chatbot and not a no-code app-builder project. I need to own the code and be able to keep building on it. The app should... (Budget: $750 - $1500 USD, Jobs: AI Chatbot Development, AI Development, Backend Development, Database Management, Frontend Development, GitHub, Next.js, Supabase)