Architecting a production B2B SaaS platform requires careful choices around data security, tenant isolation, and API throughput. Here is the modern TypeScript stack architecture I rely on for high-performance SaaS applications.
Architectural Stack Layers
- **Frontend Layer**: Next.js 15 App Router with React Server Components, TypeScript, and Tailwind CSS for instant UI rendering.
- **API & Business Logic**: NestJS (Node.js framework with TypeScript) providing modular micro-services, dependency injection, and clean DTO validation.
- **Database Layer**: PostgreSQL with connection pooling (PgBouncer/Neon) and Drizzle ORM for type-safe database queries and migrations.
- **Caching & Queueing**: Redis with BullMQ for background job processing (sending emails, webhook retries, automated reports).
Multi-Tenancy Strategy
Row-Level Security (RLS) or tenant ID context filtering ensures that tenant organization data is strictly isolated across all database queries.
[Read Case Study: Multi-Tenant SaaS Platform](/work) or [Build Your SaaS](/services/saas-development).