Clean Architecture Study Portal

Quick recall Q&A

• Q: Where do CQRS handlers live?
• A: In the Application layer because they orchestrate use cases.

• Q: How do you keep Infrastructure replaceable?
• A: Define interfaces in Application/Domain, implement in Infrastructure, and wire with DI.

• Q: How does Clean Architecture relate to DDD and vertical slices?
• A: DDD shapes the Domain model, while vertical slices organize Application use cases. Clean Architecture defines dependency flow around them.

• Q: When would you relax strict layering?
• A: Only when performance profiling proves a bottleneck and the decision is documented.