Domain-Driven Design Lite
Model the business, not the database.
The parts of Domain-Driven Design worth adopting even without the full ceremony: a ubiquitous language shared with domain experts, entities vs. value objects, aggregates as consistency boundaries, domain events between them, and bounded contexts - the strategic idea that the same word means different things in different parts of the business. Plus an honest take on when DDD is overkill.
Lessons in this stage
- 01
Modeling the Domain
IntermediateWhat DDD is really about - putting the business model at the center - and the ubiquitous language that keeps code, conversation, and the domain in sync.
14 min - 02
Entities & Value Objects
IntermediateThe two kinds of domain object: entities with identity that changes over time, and immutable value objects defined only by their attributes (Money, DateRange).
15 min - 03
Aggregates & Consistency
AdvancedAn aggregate is a cluster of objects guarded by a root that enforces invariants - the transactional consistency boundary, and why you reference other aggregates by id.
16 min - 04
Domain Events
AdvancedModel 'something happened' as a first-class object. Events decouple aggregates and enable eventual consistency across a boundary, building on the observer pattern.
14 min - 05
Bounded Contexts
AdvancedThe strategic heart of DDD: the same word ('account', 'customer') means different things in different parts of the business - draw boundaries and map the relationships between them.
15 min - 06
Repositories & When to Use DDD
IntermediateThe tactical supporting cast - repositories, domain services, factories - and a clear-eyed verdict on when DDD's investment pays off versus when it's overkill.
14 min