What are Clean Architecture and DDD? Have you worked with them?

Clean Architecture is an approach to software design that separates the system into layers with clear dependencies directed inward. The main idea is to separate business logic from implementation details (UI, databases, external services) to improve testability, maintainability, and flexibility.

Domain-Driven Design (DDD) is a development methodology focusing on a deep understanding of the domain and building a model that reflects the business logic. In DDD, concepts such as entities, aggregates, repositories, and domain services are distinguished, which helps structure the code around business rules.

In practice, I have used both approaches: building layered architecture with a domain layer, infrastructure, and interfaces. For example, in Go, I created packages for domain models and services, and interacted with databases and external APIs through interfaces, which facilitated testing and component replacement.