Clean Architecture & Domain-Driven Design in NestJS
Most NestJS tutorials stop at controllers calling services calling a database. This course is about what comes after that: how to structure a real backend so business logic lives in one place, is fully unit-testable, and doesn’t fall apart when requirements change.
Together we build a complete e-commerce system from scratch – products, customers, orders, and payments – as four autonomous bounded contexts, applying Domain-Driven Design and Clean Architecture patterns to every layer.
What You'll Learn
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Structure a NestJS backend into bounded contexts with clean domain, application, infrastructure, and presentation layers
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Implement CQRS with commands, queries, and handlers using @nestjs/cqrs
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Apply ports and adapters to swap PostgreSQL for MongoDB — or one notification provider for another — without touching business logic
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Integrate Stripe payments and webhooks behind clean architecture boundaries
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Design rich domain models with aggregates, entities, and value objects that make invalid state unrepresentable
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Emit domain events from business logic and orchestrate workflows across bounded contexts with sagas
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Enforce business invariants and state machines inside aggregates instead of scattering rules across services
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Implement real-world email notifications with Mailtrap