LLD Domain Modeling: Final Anti-Pattern Guide (How Good Designs Slowly Turn Bad)

Short summary

A guide to how good domain models degrade over time through common anti-patterns: passive entities with logic dumped into services, fragmented services without clear ownership, cross-context coupling, primitive obsession, premature abstraction, and missing state machines. The root cause is always unclear ownership of business behavior. Strong modeling foundations — clear entities, centralized invariants, well-defined aggregates — prevent long-term decay. Not AI-related.

• •Good designs degrade through small modeling mistakes: passive entities, fragmented services, cross-context coupling
• •Root cause of most failures is unclear ownership of business behavior
• •Strong foundations: clear entity responsibilities, centralized invariants, strict bounded contexts, explicit state machines

Generated with AI, which can make mistakes.