Domain-Driven Design (DDD)
Domain-Driven Design (DDD) is a software design approach that structures code around the business's real concepts and vocabulary, the "ubiquitous language", instead of technical constraints. Complex business rules are isolated in a domain core that stays independent from the database or framework.
On an ERP or internal business tool, business rules change constantly: new commercial exceptions, new workflow statuses, new regulatory constraints. DDD lets those rules live in a clearly identified module that developers can change without breaking the rest of the application. It's also a communication tool: by forcing the technical team and the business team to share the same vocabulary, it cuts down on the misunderstandings that turn into costly rework and misread specs.
The classic mistake is applying DDD to a simple CRUD app: the discipline it requires (aggregates, value objects, domain boundaries) adds a layer of abstraction that only pays off if the business logic is genuinely complex and built to last. On a small tool or an MVP, that rigor just slows development down without any real benefit. DDD is an investment worth making only for systems meant to live and grow over several years.
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