Tell me about Clean Architecture, Hexagonal Architecture, DDD — are you familiar with them, have you worked with them?

Clean Architecture is an approach to software design that divides the system into layers with clear dependencies pointing inward. The main idea is to separate business logic from implementation details (UI, databases, external services). This makes testing, maintenance, and scaling easier.

Hexagonal Architecture (Ports and Adapters) is similar in concept: the application is surrounded by ports (interfaces) through which it interacts with the external world, and adapters implement these interfaces for specific technologies. This increases modularity and independence from infrastructure.

DDD (Domain-Driven Design) is a development methodology focused on a deep understanding of the domain and building a model that reflects business logic. In DDD, entities, aggregates, services, repositories are distinguished, and Ubiquitous Language is used — a common language between developers and domain experts.

In working with ERP systems, I applied DDD principles to model business processes, and also used ideas from Clean Architecture to separate application layers, which facilitated system support and development.