Have you heard of Domain-Driven Design (DDD)? Have you applied patterns from DDD in your work?

Yes, Domain-Driven Design (DDD) is an approach to designing complex software systems that focuses on a deep understanding of the subject area and close collaboration with domain experts.

The main patterns of DDD include:

• Entities — objects with a unique identity.
• Value Objects — objects without identity, defined by their attributes.
• Aggregates — clusters of related objects managed through a root entity.
• Repositories — abstractions for data access.
• Services — operations that do not belong to specific entities.

In my experience applying DDD in Go, I used these patterns to clearly separate responsibilities, improve readability, and support the code. For example, I defined aggregates as structures with methods encapsulating business logic, and implemented repositories through interfaces for easy replacement of data stores.