SaaS App Stacks API

Begin with the tenant model

Decide what a tenant represents: an organization, a workspace, or another boundary in the product. Then define whether users can belong to several tenants and how their roles differ between them. These choices affect data access, invitations, support tools, and background jobs. They deserve an explicit model before the interface grows around them.

Microsoft's multitenant architecture guidance treats tenancy as an architectural concern across a solution. Use the same discipline regardless of hosting provider: choose where resources are shared, where isolation is needed, and who owns the consequences. There is no single arrangement that removes every cost and operational tradeoff.

Follow one customer workflow end to end

Trace a representative action, such as importing a dataset and notifying teammates. Identify the request that starts the work, the account permissions it requires, the worker that performs it, and the record showing its outcome. Carry tenant context through the entire path so scheduled jobs and support operations obey the same boundaries as interactive requests.

Treat billing and entitlement as related but distinct concerns. A payment event may update what a customer is allowed to use, but the application needs defined behavior for delayed events, repeated notifications, and changes that arrive out of order. Make the current entitlement inspectable without reconstructing it from a browser screen.

Choose integrations for their operating model

For authentication, messaging, storage, or payments, compare more than the initial SDK example. Ask how the team will handle outages, test changes, rotate credentials, export records, and explain a failed operation to a customer. Keep provider-specific logic behind an application boundary where that makes future replacement practical.

Decide what happens when an account is suspended or closed. Background jobs, credentials, retained files, and shared memberships may all need attention. Define which records remain available to support a legitimate business process and which should be removed according to the product's stated policies.

Validate with two customer accounts

Create a realistic test workflow involving separate tenants, a user with different roles, and a delayed background task. Confirm that each action reaches only the intended records. This scenario gives the stack a concrete acceptance condition before a starter template or framework choice becomes permanent.