System Architecture
The high-level structure of a software system — its major components, their responsibilities, and how they communicate.
In depth
Good architecture answers three questions clearly: where does data live, how do components fail independently, and how does the system scale from 10 users to 10 million?
For SaaS, most early systems converge on a similar shape: a web/app tier, an API tier, a primary database, background workers, and a cache. The interesting architecture is everything that happens at the boundaries — auth, rate limits, integrations, retries.
Put it into practice
Related terms
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Last reviewed 14 April 2026 by Abhi Verma.