What backend should I use for a SaaS web app
For most SaaS web apps, a managed Postgres platform like Supabase or Neon plus a framework like Next.js covers 90% of needs. Supabase adds auth, storage, and realtime on top of the database, which shortens time-to-first-customer significantly.
If your team prefers infrastructure-as-code and typed backends, look at Encore or plain Postgres + Prisma on Railway/Fly. Firebase remains a strong pick for mobile-heavy products.
The honest answer: your backend choice matters less than your billing model and retention. Pick the one your team ships fastest on.