How to Build a SaaS Product from Scratch
From multi-tenant architecture to billing and scaling - complete SaaS platform building guide.
What is this guide about
Building a SaaS (Software as a Service) product is one of the most scalable approaches to technology business. The subscription model generates predictable revenue, and the cloud eliminates the need for on-premise installation.
However, SaaS is not just code - it is a complex ecosystem encompassing multi-tenant architecture, billing and payments, user onboarding, data security, and continuous value delivery. Each of these elements requires a thoughtful strategy.
This guide walks you through key architectural and business decisions, from choosing a tenant isolation model, through implementing a payment system, to strategies for scaling infrastructure as your user base grows.
Key topics
Choose between shared database, schema-per-tenant, and database-per-tenant depending on isolation requirements and scale. Shared database is cheapest but requires careful design. For enterprise SaaS, consider a hybrid approach with dedicated resources for the largest clients.
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