What is SaaS, and should you build one?

Software as a Service is delivered over the web on subscription, with the provider handling hosting, updates, and scale. It underpins most modern business software.

Building one means recurring revenue and scale — but demands solid multi-tenant architecture and security.

Why this matters for your business

Software as a Service delivers applications over the web on a subscription, with the provider handling hosting, updates, security, and scaling. For customers it means access anywhere, always up to date, with no installs — which is why SaaS underpins most modern business software. For a business considering building one, SaaS offers recurring, predictable revenue and the ability to serve many customers from one product.

Building a SaaS product is more demanding than a single-customer application: it needs multi-tenant architecture (serving many customers securely from shared infrastructure), subscription billing, strong security and data isolation, and the ability to scale as you add users. Get those foundations right and the model compounds; get them wrong and growth becomes painful. It suits ideas that solve a repeatable problem for many customers rather than bespoke needs. Breeur builds SaaS products end to end — architecture, billing, security, and auto-scaling on AWS, Azure, or Google Cloud — with the foundations in place to scale from your first customers to many.

If you are considering building a SaaS product, the important thing to understand is that it demands more than a single-customer application, and that the model's rewards follow from getting those foundations right. Software as a Service delivers applications over the web on a subscription, with the provider handling hosting, updates, security, and scaling, which is why customers get access anywhere, always up to date, with no installs — and why SaaS underpins most modern business software. For a business, the appeal is recurring, predictable revenue and the ability to serve many customers from one product. But building one properly means multi-tenant architecture that serves many customers securely from shared infrastructure, subscription billing that handles cycles and failed payments gracefully, strong security and data isolation, and the ability to scale as you add users. Get those right and the model compounds; get them wrong and growth becomes painful, with security or performance problems that are expensive to fix later. It suits ideas that solve a repeatable problem for many customers rather than bespoke needs, so validating that fit early matters. When you engage a partner, look for genuine multi-tenant and scaling experience, not just app-building, and ask how they handle billing, isolation, and security. Start with a focused version that proves demand before building out, because a SaaS product is a long-term commitment rather than a one-off build. Approached this way, SaaS turns software from a project into a product with its own compounding revenue — but only if the unglamorous foundations of tenancy, billing, security, and scale are engineered properly from the start.

Sources

1. Flexera, State of the Cloud 2025
2. Digital transformation statistics 2025

Figures are drawn from the third-party sources cited above and were cross-checked against them. They reflect industry-wide research and estimates — not guarantees of specific outcomes — and some are indicative industry figures rather than exact measurements.