What is the best tech stack for a SaaS MVP?
The best tech stack for a SaaS MVP is one that ships fast now and does not force a rewrite once you have traction. For most founders that means a JavaScript stack: React or Next.js on the front end, Node.js on the back end, and a database that fits the data. It is fast to build, easy to hire for, and it scales.
Let me explain the pieces.
Front end: Next.js or React
Next.js is a strong default. It handles routing, rendering, and performance out of the box, and it is good for the marketing pages and the app. Plain React is fine for an app that lives entirely behind a login.
Back end: Node.js, with NestJS if it grows
Node.js keeps the whole stack in one language. For a small MVP, a simple Express or Node API is enough. If the product is clearly going to grow, NestJS adds structure that pays off later.
Database: fit it to the data
MongoDB is flexible and fast to start with, which suits many MVPs. A relational database like PostgreSQL is the better choice when your data has clear relationships and you need strong consistency. Pick based on the data, not the hype.
The parts you should not build yourself
Authentication, payments, and email are solved problems. Use proven tools for them. Building your own auth or billing for an MVP wastes time you should spend on your actual product.
The honest truth about stacks
The stack matters less than scope and delivery speed. A well-scoped MVP on a boring, proven stack beats a clever stack that never ships. Choose something standard, then focus on shipping.
This is how I build SaaS products. See my SaaS development service, or tell me what you are building and I will recommend a stack for your case.