Multi-Tenant SaaS Architecture
A multi-tenant framework reference build on row-level security database isolation.
Isolation Policy (Designed)
Strict RLS
Target Edge Latency
<50ms
Setup Overhead Target
Zero
The Problem
Building a SaaS application requires solid tenant isolation. If a tenant's database queries leak into another tenant's workspace, it is a catastrophic security failure. We built a concept project demonstrating absolute data isolation using a single database.
The Approach
The design specifies PostgreSQL Row Level Security (RLS) policies at the database layer. By defining a global tenant_id session variable, all select, update, and insert operations would be filtered at the database engine level. In this design the Next.js application acts as a thin proxy, setting the current tenant context from request headers.
The Outcome
Designed as a multi-tenant reference architecture using database-level security policies to enforce explicit tenant isolation across all query execution paths.
Key Learnings
A constraint identified during design: PostgreSQL session variables require transaction connection pooling instead of session connection pooling, meaning connection management must be handled carefully to avoid scale bottlenecks.
Build Details
Technologies Used
Quality Assurances
- WCAG 2.2 AA Accessible
- Input Sanitization Checked
- Decoupled architecture ready
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