Context
Two business customers use the same SaaS product, but they do not necessarily need identical infrastructure arrangements. One may accept shared application capacity while another requires separate data handling and a different recovery process. Define the tenant and the operating responsibilities before choosing the deployment model.
Describe the customer boundary
Write down whether a tenant is a company, division or another business grouping. Identify which users may belong to multiple tenants and how they deliberately switch context. Include support staff and automation identities in the access model.
Microsoft's multitenant architecture guidance distinguishes the commercial SaaS model from the architectural choice to share components. Its tenancy guidance also treats isolation, cost, automation and service commitments as design considerations. A SaaS application does not require every component to be shared.
Map every place tenant data travels
Review database access, object storage, caches, search indexes, exports, scheduled jobs and telemetry. A tenant filter in one database helper does not establish isolation for a separately generated report or a public storage URL.
For each path, identify how trusted tenant context is established and how the destination enforces it. Pay particular attention to background jobs and support tools, where the original browser session is no longer present.
Compare models using real operating work
Evaluate onboarding, configuration changes, schema upgrades, customer removal and restoration. Ask the team to describe how it would restore one customer without overwriting another. A lower hosting bill can be offset by an operating procedure the team cannot execute safely.
Document capacity boundaries as well. If one customer's workload expands sharply, decide how the system detects pressure and what prevents it from degrading unrelated customer work.
Build a tenant-separation test pack
Create two isolated test tenants and accounts with deliberately different permissions. Attempt cross-tenant reads, updates, downloads and exports using known record IDs. Test cached responses and delayed jobs, not just interactive pages. Verify that account suspension changes the permitted operations.
Retain the results with the architecture decision and revisit them when sharing rules change.
Clouvenix can help with custom application development and cloud architecture.