Summary

This chapter overviewed Vertical Slice Architecture, which flips layers by 90°. Vertical Slice Architecture is about writing minimal code to generate maximum value by getting superfluous abstractions and rules out of the equation by relying on the developers’ skills and judgment instead.

Refactoring is a critical factor in a Vertical Slice Architecture project; success or failure will most likely depend on it. We can use all patterns with Vertical Slice Architecture. It has lots of advantages over layering with only a few disadvantages. Teams who work in silos (horizontal teams) may need to rethink switching to Vertical Slice Architecture and first create or aim at creating multi-functional teams instead (vertical teams).

We replaced the low-value abstraction with commands and queries (CQRS-inspired). Those are then routed to their respective Handler using the Mediator pattern (helped by MediatR). That allows encapsulating the business logic and decoupling...