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Multi-Tenant SaaS Architecture

Learn multi-tenant SaaS architecture: tenancy models, tenant isolation, row-level security, sharding, noisy neighbours, lifecycle, billing and compliance.

Learn Multi-Tenant SaaS Architecture free, in English or Hindi, with lessons, shorts and interview questions.

Start course → · Interview questions

32 lessons · 11 modules · Free

What you'll learn

  • Explain tenants, memberships and the silo, pool and bridge tenancy models, and choose one with clear trade-offs.
  • Resolve and propagate tenant context safely from the edge through services, queues and background jobs.
  • Isolate tenant data with database-per-tenant, schema-per-tenant or shared tables protected by row-level security.
  • Scale a pooled platform with tenant sharding, rate limits, fair queues and online tenant moves.
  • Run the tenant lifecycle: idempotent provisioning, wave-based migrations, export and verifiable deletion.
  • Add plans, entitlements, metering, per-tenant keys, data residency, audit logs and per-tenant observability.

Syllabus

The Multi-Tenant Mental Model

  1. What Multi-Tenancy Means
  2. Tenants, Users and Memberships
  3. Why SaaS Is Built This Way

Tenancy Models

  1. Silo, Pool and Bridge Models
  2. Tiering Tenants by Plan
  3. Choosing a Tenancy Model

Tenant Identity and Request Context

  1. Resolving the Tenant for a Request
  2. Propagating Tenant Context
  3. Identity Tokens and Tenant Claims

Data Isolation Patterns

  1. Database per Tenant
  2. Schema per Tenant
  3. Shared Tables with a tenant_id

Enforcing Isolation in Shared Databases

  1. Row-Level Security in PostgreSQL
  2. Scoping Every Data Access Path
  3. Testing Tenant Isolation

Scaling: Sharding and Noisy Neighbours

  1. Sharding by Tenant
  2. Taming Noisy Neighbours
  3. Moving Tenants Between Shards

Tenant Lifecycle Operations

  1. Onboarding and Provisioning
  2. Schema Migrations Across Many Tenants
  3. Offboarding, Export and Deletion

Plans, Customisation and Metering

  1. Plans and Entitlements
  2. Per-Tenant Configuration and Customisation
  3. Metering Usage for Billing

Security and Compliance per Tenant

  1. Per-Tenant Encryption Keys
  2. Data Residency and Regional Deployments
  3. Audit Logs and Support Access

Observability and Cost per Tenant

  1. Tenant-Aware Observability
  2. Cost per Tenant and Unit Economics

Revision and Interview Prep

  1. Cheat Sheet: Multi-Tenancy on One Page
  2. Common Interview and Exam Questions
  3. Mixed Self-Check

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