SOFTWARE ARCHITECTURE
SaaS Platform Architecture
This SaaS platform architecture separates the client entry point from the services that manage identity, tenants and billing. The API gateway is the boundary for web and mobile traffic. Tenant and billing services share the records needed to operate subscriptions, while the event queue provides a place for asynchronous work. It is a useful starting point for explaining a multi-tenant product without drawing every endpoint or database table.
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CASE ANALYSIS
Scenario
Planning the core services for a multi-tenant SaaS product.
Key decisions
- Gateway boundary: Put client traffic through one API gateway.
- Tenant ownership: Keep tenant operations in a dedicated service.
- Shared records: Let tenant and billing services use the tenant database.
- Async work: Publish service events to a queue.
When to reuse this
Use this view when defining the first shared services of a SaaS product.
FAQ
Frequently asked questions
What should a SaaS architecture diagram show?
Show the client entry point, the main product services, the data stores they use and any asynchronous message path.
Why use an API gateway?
It gives clients one controlled entry point before requests reach internal services.
When is an event queue useful?
Use one for work that can happen after a request, such as notifications, billing updates or background processing.
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