Building a Multi-Tenant SaaS Platform

In this article, we'll explore the architecture decisions behind our multi-tenant SaaS platform.

Key Design Principles

1. Tenant Isolation

Each tenant's data is logically isolated to ensure security and privacy:

interface Tenant {
  id: string;
  subdomain: string;
  customDomains?: string[];
  settings: TenantSettings;
}

2. Domain Routing

We use middleware to detect and route requests based on hostname:

• customerA.example.com → Tenant A
• customerB.example.com → Tenant B
• Custom domains via CNAME

3. Performance Optimization

• Edge Caching: Static assets cached at CDN edge
• Database Indexing: Tenant-aware indexes for fast queries
• Connection Pooling: Efficient database connection management

Challenges We Faced

1. Cross-Tenant Queries: Ensuring no data leakage
2. Scaling: Handling thousands of tenants
3. Customization: Per-tenant theming and features

Results

• 99.99% Uptime
• <100ms Response Time
• 10,000+ Active Tenants

Conclusion

Building a multi-tenant platform requires careful planning, but the benefits are worth it. Stay tuned for more deep dives!