Senior Full-Stack Developer for SaaS

I need a senior full-stack developer to take over A-Grow, our live e-commerce operations web app built on Vercel serverless and Supabase Postgres, and turn it into a multi-tenant SaaS I can sell to my students. The work includes isolated workspaces, Shopify and Meta connection per student, and a Stripe credit system for AI usage. This is a long-term role where you will own the codebase, deliver in fixed-price milestones, and maintain the product after launch.