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SaaS Engineering•2026-07-01•8 min read
Building Multi-Tenant SaaS Platforms: Data Isolation, Security, and Scalability
Architectural patterns for multi-tenant software, custom domain routing, and tenant data partitioning.
RazaDevX
Full Stack Developer & Systems Architect
#Multi-Tenant SaaS#Row Level Security#SaaS Architecture#Next.js Multi-Tenancy
Multi-tenancy allows a single application deployment to serve multiple business customers (tenants) while ensuring total data privacy, custom configuration support, and shared infrastructure cost efficiency.
1. Multi-Tenancy Database Isolation Models
- ›Pooled (Discriminator Column): All tenants share tables with a tenant_id column combined with Postgres Row Level Security (RLS).
- ›Schema-per-Tenant: Each tenant receives an isolated schema within the same database instance.
- ›Database-per-Tenant: Complete physical isolation with dedicated database instances for enterprise clients.
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