If you want to know how to design and code an application with Modular Architecture, or with Layered Architecture or with Hexagonal Architecture (Clean Architecture), or with Microservice Architecture this book is for you. If you are a developer who is always trying to write clean, solid and elegant software structures, this book is for you. If you have had the bad experience of having to maintain a complex "big ball of mud" enterprise application, with pressure from the business to go to production with new features under an aggressive schedule, you, better than anyone, know how important is to have a solid architecture with clear defined rules where we can make modifications, having an understanding where every change will impact.