1. Intro tl;dr Instead of forcing your application into a prescriptive template like Clean or Hexagonal Architectures, get back to basics and use patterns from Modular Software Design. Divide the application into independent modules, each containing business logic representing a specific process. For modules with complex business logic, extract the infrastructure-related code into separate Infrastructure-Modules. This will enable you to build an application characterized by low cognitive load, high maintainability, and high extensibility.