SaaS

Multi-Tenant SaaS — One Platform, Many Customers

You are building a SaaS product. Customer A data must never touch Customer B. But running a separate database per customer is expensive. This blueprint shows secure multi-tenancy at near-zero idle cost.

Client Profile
Reference Architecture
Timeline
4 Weeks
Core Tech Stack
Cognito API Gateway Lambda DynamoDB CloudFront

The Challenge

Multi-tenancy is one of the hardest problems in SaaS. Too loose and you risk data leakage. Too strict and you are running 50 separate databases. This blueprint enforces tenant isolation at the infrastructure level — not just in application code.

The Problem

Most SaaS apps enforce tenant isolation in application code: only return records where tenant_id = X. That works until a developer forgets the filter. One incident like that ends your business.

The Architecture

  • Cognito User Pools store tenant context in JWT tokens
  • API Gateway Lambda Authorizer validates tenant context on every request before your code runs
  • DynamoDB single-table design with tenant_id as partition key prefix
  • IAM resource-based policies restrict Lambda roles per tenant tier

What You Get

  • Tenant isolation enforced at infrastructure level
  • Onboard new tenants in minutes — no new infrastructure
  • Idle tenants cost nothing

Business Impact

Idle Cost $0
Tenant Isolation Infrastructure-level
Want This Built for You?

This is a reference architecture we can deploy and adapt to your specific requirements.

Book a Free Architecture Review