Multi-Tenant SaaS Backend Stack (NestJS, Prisma, PostgreSQL, Redis, Stripe, Docker) overview

A multi-tenant SaaS backend using NestJS for its modular architecture, dependency injection, and built-in support for guards, interceptors, and middleware. Prisma provides type-safe database access with tenant isolation via row-level security or schema-per-tenant patterns in PostgreSQL. Redis handles per-tenant rate limiting, caching, and feature flag evaluation. Stripe manages tenant billing, subscription tiers, and usage-based metering. Zod validates API payloads at runtime. Docker enables consistent deployment across environments. This stack is designed for B2B SaaS products where tenant data isolation, per-tenant configuration, and usage-based billing are first-class concerns. The tradeoff is architectural complexity — tenant context must propagate through every layer of the stack, and schema migrations must be tested across all tenant configurations.