Multi-Tenant SaaS Foundation. @multi-tenant-foundation

Multi-tenancy is the SaaS decision that is cheap early and brutal late. Products that grow from a single-customer codebase end up with tenant checks scattered through application code — and one forgotten WHERE clause away from showing one customer another's data. The Multi-Tenant SaaS Foundation puts tenancy where it belongs: in the architecture, enforced by structure rather than developer discipline.

The finish state is a product where isolation is a property, not a habit: a deliberate tenancy model, data boundaries enforced at the database layer, organizations and memberships modelled properly, and application patterns that make the next feature tenancy-safe by default.

Tenancy Model

The isolation approach chosen for your economics and risk — shared schema with row-level security, schema-per-tenant, or hybrid — with the trade-offs documented as a decision record.

Data Isolation

Tenant boundaries enforced at the data layer — row-level security policies, scoped connections, and tests that prove cross-tenant queries fail structurally.

Organization Structure

Organizations, workspaces, memberships, and invitations modelled as first-class entities — the account structure enterprise customers expect on day one of procurement.

Tenancy-Aware Patterns

Application-layer scaffolding — tenant context propagation, scoped storage and jobs, per-tenant configuration — so every future feature inherits isolation instead of re-implementing it.

1. Scope — Audit the current data model and code paths, choose the tenancy model, and plan the migration for existing data.
2. Build — Land the data-layer isolation and organization entities, migrate existing customers, and retrofit the application patterns.
3. Handover — Isolation test suite green, migration complete, and the tenancy patterns documented for your team's future work.

The Multi-Tenant SaaS Foundation is a menu item on the Scrums.com delivery catalog, available at every plan tier. Add it to your plan backlog and your delivery team schedules it like any other item — scoped, tracked, and reported through the SEOP. See Delivery Plan Tiers.

We already have customers on a single-tenant codebase. Can you migrate us live?

Yes — that is the common case. The migration is planned and rehearsed in scoping, run incrementally, and verified per tenant, with rollback points rather than a big-bang cutover.

Which isolation model will you choose?

The one your risk profile and economics justify: row-level security in a shared schema serves most SaaS products; regulated or enterprise-heavy products may warrant stronger separation. You get the reasoning, not just the choice.

What naturally follows this foundation?

Tenancy unlocks the rest of the SaaS machinery: the SaaS Role-Based Access Control and SaaS Billing & Subscription System items build directly on the organization structure this sprint lands.