Designing Lean Web Adapters: Slicing Controllers in Hexagonal Architecture

Large, bloated controllers often turn clean architecture into a maintenance nightmare. By slicing controllers into focused, single-responsibility components, you can keep your web adapters clean and fully aligned with hexagonal architecture principles. This text-based course guides you through the transition from monolithic controllers to highly modular web adapters. You will learn how to isolate HTTP concerns, map incoming requests to domain use cases, and structure your entry points for maximum clarity and testability. What you'll learn: 1. Understand the core principles of hexagonal architecture and the role of driving adapters. 2. Apply the Single Responsibility Principle to slice monolithic controllers into lean, single-action handlers. 3. Map web-specific data transfer objects to clean domain models without leaking HTTP details. 4. Implement modern API routing, validation patterns, and error-handling conventions. 5. Structure and write focused unit tests for web adapters using modern testing practices. You will start with the fundamental concepts of ports and adapters before diving into step-by-step refactoring techniques. The material guides you through practical code scenarios, showing you exactly how to split responsibilities and clean up your codebase. This course is designed for software developers, backend engineers, and architects who want to improve their API design skills. A basic understanding of web development and object-oriented concepts is recommended, but no prior experience with hexagonal architecture is required. Start reading today to build cleaner, more maintainable web applications.