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A: More than ever. As microservices fail due to poor boundaries, teams are rediscovering DDD. The "18 new" mindset is the standard for Platform Engineering teams.

Domain-Driven Design by Eric Evans: The Definitive Guide (2026 Edition)

Once the boundaries are set, tactical design provides a set of patterns to model the domain inside a single Bounded Context.

15. Hexagonal Architecture (Ports and Adapters): Isolating the domain from technical infrastructure.16. CQRS (Command Query Responsibility Segregation): Separating read and write models to improve scalability.17. Saga Pattern: Managing long-running transactions across services.18. Reactive DDD: Applying reactive programming principles to domain modeling.19. Testing Strategy: Using domain-driven testing to ensure business rules are met. Getting the Resources: EPUB and References