SaaS Development
Building a SaaS MVP: 7 Architecture Decisions to Get Right Early
By Dishant Chanchad · · 2 min read
Most of a SaaS MVP can be simple, but a few early decisions are expensive to change later. Here are seven worth making deliberately.
Keep the MVP small, but not careless
A SaaS MVP should do one core job well, for one type of customer, with billing in place so you can learn whether people will pay. Most features can be rough at first. A handful of architecture decisions, though, shape everything that follows, and changing them after launch is slow and risky. These are the ones to get right early.
The seven decisions
1. Your tenancy model
Will customers share one database with their data separated by an account ID, or will each customer get their own database? Shared (multi-tenant) is simpler and cheaper to run for most products. Separate databases make sense when customers need strict isolation or data residency. Decide deliberately, and enforce the separation in one place in the code, not in every query.
2. Authentication and roles
Almost every SaaS ends up needing teams: invite colleagues, assign roles, remove access. Design users, organisations and roles from the start, even if the first version has only "admin" and "member". Enterprise customers will later ask for single sign-on, so choose an approach that can add it.
3. Billing
Plans, trials, upgrades, downgrades, taxes and failed payments are more complex than they look. Use a proven billing provider rather than building your own, and keep your own record of which plan and features each account has.
4. The data model
Spend time on the core entities and how they relate. A clear data model makes new features easier; a muddled one makes every feature harder. Add audit fields (who created or changed a record, and when) from day one.
5. Background jobs
Emails, imports, exports, reports and integrations should not run inside a web request. Set up a simple job queue early so slow work runs in the background and can be retried when it fails.
6. Observability
Error tracking, logs and basic uptime monitoring cost little to add at the start, and they are how you will find out about problems before your customers tell you.
7. Deployment and environments
Automated deployment, a staging environment and database backups should exist before the first paying customer. They turn releases into routine events instead of risky ones.
What you can safely postpone
- Microservices: a well-structured single application is easier to build and run at MVP scale.
- Complex caching and performance tuning, until real usage shows where the bottlenecks are.
- Every nice-to-have integration: add them when customers ask.
- Custom analytics dashboards: start with a product analytics tool.
Conclusion
A good SaaS MVP is small in scope but solid underneath. Make the few decisions that are expensive to reverse carefully, write them down, and keep everything else simple until customers show you where to invest.