I built a Next.js + Firebase SaaS foundation because I was tired of rebuilding auth, workspaces, and RBAC from scratch

Over the past few weeks, I built SaaSStinger Lite — a production-ready SaaS starter for developers who build with Next.js + Firebase.

The reason I made it was simple: every time I start a new SaaS, I end up rebuilding the same core infrastructure before I can even focus on the actual product.

The parts that usually take the most time are not the UI.
It is the application architecture:

• authentication

• user profiles

• workspaces

• memberships

• roles

• RBAC

• invitations

• audit logs

• usage tracking

• workspace settings

• Firestore security rules

For SaaSStinger Lite, I tried to treat those as real product infrastructure, not just starter-kit features.

What it includes

• Next.js 16

• React 19

• TypeScript

• Firebase Authentication

• Cloud Firestore

• multi-workspace architecture

• OWNER / ADMIN / MEMBER roles

• invitation flow

• audit logs

• usage tracking

• service-layer structure

• production documentation

• Firebase-first architecture

One of the main things I cared about was keeping it compatible with the Firebase Spark plan.

I wanted it to be useful for developers who want to start building without immediately needing to add Cloud Functions or move to a paid Firebase setup just to get the foundation working.

The product is now live on Whop as a one-time purchase.

I would genuinely love feedback from people building SaaS with Next.js or Firebase:

What part of the SaaS foundation do you find yourself rebuilding most often?