Building Scalable SaaS Architecture: Lessons from 50+ Projects

## Introduction After building over 50 SaaS platforms, we've learned that scalability isn't just about handling more users—it's about building systems that can evolve with your business. ## Multi-Tenancy Done Right The foundation of any SaaS platform is its multi-tenancy strategy. We've found that a hybrid approach works best for most use cases: - **Shared database with tenant isolation** for most data - **Dedicated resources** for compute-intensive operations - **Tenant-aware caching** to prevent data leaks ## Event-Driven Architecture Moving to an event-driven architecture was a game-changer for our clients: ```typescript // Example event structure interface DomainEvent { id: string; tenantId: string; type: string; payload: Record; timestamp: Date; } ``` ## Key Takeaways 1. Start with a clear data isolation strategy 2. Build observability in from day one 3. Plan for multi-region early 4. Automate everything