What tenancy means
A tenant is usually a company, workspace, organization, or customer account inside the SaaS product. Each tenant may have users, settings, data, subscriptions, and permissions.
The architecture must keep tenant data separated and easy to manage.
Core architecture decisions
Teams need to decide how data is isolated, how roles work, how subscriptions are handled, how admin tools operate, and how support teams can help customers safely.
These decisions are harder to change later, so they belong in early planning.
Scaling the product
As the product grows, architecture must support more users, more data, reporting, integrations, billing plans, and customer-specific configuration.
A SaaS platform should be built for the business model, not just the first demo.