Can you build a SaaS MVP with MERN?

Yes. SaaS MVPs are one of our most common MERN engagements. The MVP stack uses MongoDB with a shared-database tenancy pattern (simplest to ship, easiest to operate), Stripe subscription billing with webhook handling and dunning, JWT authentication with refresh token rotation, and a React admin dashboard. Multi-tenancy white-labelling, SSO, and compliance features move to the post-MVP roadmap unless the product cannot launch without them. See our MERN SaaS development page for full SaaS architecture detail.