Next.js 16 + Supabase + Vercel Production Blueprint

This is the exact stack powering multiple revenue-generating SaaS products right now. Next.js 16 with the App Router, Supabase for authentication and PostgreSQL, and Vercel for deployment. If you are starting a new project in 2026, this combination gives you the fastest path from idea to production with minimal infrastructure overhead. The architecture starts with a clean project structure. Your app directory contains route groups for (auth), (dashboard), and (marketing). Each group has its own layout. The auth group handles sign-in, sign-up, and password reset flows using Supabase Auth. The dashboard group is protected by middleware that checks the session on every request. The marketing group is fully static and cached at the edge.