Get Your Hands Dirty on Clean Architecture - Second Edition

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What’s Wrong with Layers?

Chances are that you have developed a layered (web) application in the past. You might even be doing it in your current project right now.

Thinking in layers has been drilled into us in computer science classes, tutorials, and best practices. It has even been taught in books.1

1 Layers as a pattern are, for example, taught in Software Architecture Patterns by Mark Richards, O'Reilly, 2015.

Figure 2.1 – A conventional web application architecture consists of a web layer, a domain layer, and a persistence layer

Figure 2.1 shows a high-level view of the very common three-layer architecture. We have a web layer