What is SaaS?
SaaS — software as a service — is software accessed online by subscription instead of installed and owned. For customers it means no servers and always-current versions; for the company building it, it means one codebase serving many customers, recurring revenue, and full responsibility for uptime and data.
Last updated 2026-07-20 · Flowmatix
What makes SaaS architecture different
The defining problem is multi-tenancy: many customers on shared infrastructure with absolute data isolation. Add subscription billing, plan limits, roles and permissions, and onboarding flows — the 'product around the product' that first-time founders underestimate more often than the core feature itself.
From MVP to platform
The pragmatic path ships a narrow slice first: one workflow, solved end-to-end for one kind of user. Early architecture choices — data model, tenancy, auth — deserve care because they're expensive to change; feature breadth doesn't, because it's cheap to add later and expensive to maintain prematurely.
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