How to build a SaaS: start with a real problem you confirm with people willing to pay for it, define the core value (the one thing your product does excellently), ship an MVP that solves it, put it on a multi-tenant architecture with accounts, subscriptions and authentication, launch to early users, and iterate on feedback. The golden rule: don't build everything at once. A good SaaS grows through additions, not a mega-project launched blind.

At shadowforge we don't speak from theory — we build SaaS for clients and run our own products: getFinance (CRM and projects) and getSalon (booking for salons). What follows is the process as we actually apply it, awkward parts included.

Where do you start when you want to build a SaaS?

You start with the problem, not the features. The most common failure is someone with 40 features in their head and zero conversations with real customers. Flip it: find people with a concrete, recurring pain big enough that they'll pay to remove it. A SaaS sells on a monthly subscription, so the problem has to be ongoing — if it's solved once and done, you have no model.

Validation itself is a topic on its own — see «How to validate a startup idea». Here we assume you already have signals people would pay.

What is core value and how do you define it?

Core value is the single reason a customer opens your product. In getSalon it's «booking and the salon's schedule». Everything else — notifications, stats — orbits that core. Describe the value in one sentence: who, what outcome, without which pain. If it doesn't fit in a sentence, you don't have clarity yet.

Core value dictates the scope of your MVP. Don't confuse an MVP with a «cheap, ugly version» — it's the smallest version that delivers real value. We covered that in «What is an MVP»; the point is that a SaaS MVP cuts everything that isn't core.

Which building blocks does every SaaS need?

On top of core value, every SaaS has components you can't skip:

  • Accounts and authentication — sign-up, login, password reset, ideally two-factor; this is where security is decided.
  • Multi-tenancy — each customer works in isolation and never sees others' data. It's the most important architectural decision and the hardest to change later.
  • Billing and subscriptions — plans, recurring charges, upgrade/downgrade, a trial period; without this you have just a project, not a business.
  • Dashboard — where the user sees value immediately, not an empty menu.
  • Roles and permissions — admin, member, maybe an invited client; who sees what and who can change what.
  • Integrations and API — payments, email, maybe a webhook or a public API if your product lives in an ecosystem.

Honestly: you don't need all of it from day one. Multi-tenancy and authentication must be designed correctly from the start; full billing, fine-grained roles and a public API can wait.

What does the architecture look like at a high level?

At a high level, a SaaS is a web application with a database, authentication, business logic and external integrations, all running in the cloud. The key is that each tenant's data is logically separated and the system can grow without a rewrite. You don't need infrastructure for a million users on day one — but you do need decisions that don't box you in: a clean relational database, modular code, automated deployment.

The stack matters less than discipline. We work with TypeScript, PostgreSQL and a cloud that scales with traffic. Optimize for speed of shipping, not hypothetical scaling scenarios that may never come.

What pricing model do you choose for a SaaS?

The classic is a monthly or annual subscription, usually across a few plans (say Start / Pro / Business) that differ by limits or features. Reference points from the market: price per user, price by usage volume, or a fixed plan with limits. Don't overcomplicate — one plan, maybe two, is enough to launch. You adjust pricing once you see who pays.

A trial or a limited free plan helps acquisition, but be careful: free attracts users who will never pay. If you're choosing between an off-the-shelf SaaS and a custom build, that's a different conversation — see «Ready SaaS or custom development». Here we assume you're building the SaaS, not buying it.

How do you launch and how do you grow afterward?

You launch to a small group of early users, not «the whole internet». The first 10–20 real customers will tell you more than any survey. You give them access, talk to them weekly, and fix what blocks them. From the start you track a few metrics: how many sign up, how many reach the value moment, how many pay, how many stay after the first month. Without metrics you're building on guesses.

Then you iterate: each version adds a little, based on what paying users ask for, not what's fun to build. A SaaS isn't a project with an end — it's a living product.

What mistakes kill a SaaS?

We see them constantly, and they're almost always the same ones:

  • Building too much — months of development without showing the product to anyone.
  • No validation — assuming the problem exists instead of confirming it with people who pay.
  • No metrics — launching and «hoping», with no idea where users drop off.
  • Badly designed multi-tenancy — hard to fix once you have real customers in the system.
  • Pricing pulled out of thin air — or, worse, giving the product away free for too long.

The Moldovan context adds a reality: the local market is small, so a niche SaaS for Moldova only will grow slowly. Many startups here think regionally or internationally (RO/RU/EN) from the start and wire in local payments (for example MAIB) plus international ones. Building a SaaS from Chișinău for big markets is feasible — but plan cross-border early.

Honest to the end: a SaaS is a marathon, not a sprint. Start with an MVP that solves one thing well, then grow. If you want a partner who has already walked this road, shadowforge builds SaaS and web applications — and we run our own products (getFinance, getSalon) as proof that we know where the pitfalls are.