Domain Entities in Hexagonal Architecture: Input and Output Design

Building maintainable software requires clear boundaries between your core business logic and the outside world. However, developers often struggle with whether to expose internal domain entities directly or map them to separate input and output models. This text-based course helps you navigate these critical design decisions, showing you how to balance development speed with long-term code maintainability. What you'll learn: - Understand the foundational principles of Hexagonal Architecture and the role of domain entities. - Evaluate the trade-offs of using domain entities directly as input or output models for your use cases. - Design clean boundaries using Data Transfer Objects (DTOs) to prevent external API changes from breaking core business logic. - Identify architectural shortcuts and the long-term maintenance risks they introduce to your codebase. - Apply modern decoupling strategies to keep your application domain pure and testable. The course starts with essential architectural definitions and the core principles of Ports and Adapters. You will then progress through practical scenarios, analyzing real-world trade-offs of direct entity exposure versus strict mapping. This course is designed for beginner to intermediate software developers and aspiring architects who want to build cleaner systems; no prior experience with advanced system design is required. Start reading today to make more deliberate, professional architectural decisions in your software projects.