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Domain Driven Design

40 Domain Driven Design interview questions

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DDD Fundamentals


  • 1.

    What is Domain-Driven Design (DDD) and what are its core principles?

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  • 2.

    How does DDD differ from traditional data-driven or service-driven approaches?

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  • 3.

    What is the difference between the Domain Model and the Data Model in DDD?

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  • 4.

    Can you explain what Bounded Contexts are in DDD, and why they are important?

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  • 5.

    What strategies can you use to define Bounded Contexts in a large system?

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  • 6.

    How do you integrate multiple Bounded Contexts within a single system?

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  • 7.

    Why is Ubiquitous Language important in DDD, and how do you establish it?

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  • 8.

    What is the role of Entities in DDD, and how do they differ from Value Objects?

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  • 9.

    How would you identify Aggregates in a domain model, and what boundary rules apply to them?

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  • 10.

    Can you explain what a Domain Event is and give an example of when it might be used?

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Tactical Design in DDD


  • 11.

    How do Repositories function in DDD and what is their main responsibility?

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  • 12.

    What is the difference between a Repository and a Service in DDD?

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  • 13.

    How would you handle complex domain logic that involves multiple entities and value objects?

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  • 14.

    Can you delineate the role of a Domain Service versus an Application Service?

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  • 15.

    What considerations are there for implementing Aggregates to ensure transactional consistency?

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  • 16.

    How do you deal with performance issues when loading large Aggregates?

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  • 17.

    In what scenarios might you use a Specification pattern in DDD?

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  • 18.

    What are some Domain Modeling strategies to enforce invariants within an Aggregate?

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  • 19.

    Can you discuss strategies for dealing with concurrency and synchronization within Aggregates?

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Domain Events and Event Sourcing


  • 20.

    How can Domain Events help in designing a loosely coupled system?

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  • 21.

    What is Event Sourcing, and how does it differ from standard persistence mechanisms?

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  • 22.

    Can you explain how CQRS (Command Query Responsibility Segregation) complements DDD?

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  • 23.

    In what situations would you choose to implement Event Sourcing in a DDD context?

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  • 24.

    How do you typically handle events that should trigger side effects in other Bounded Contexts?

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Strategic Design and DDD Implementation


  • 25.

    How does DDD address the issue of complex domain logic changes over time?

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  • 26.

    Describe the concept of a context map in DDD and its purpose.

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  • 27.

    What is the Anti-Corruption Layer in DDD, and when would you use one?

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  • 28.

    How might you implement a Policy in DDD, and what are its advantages?

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  • 29.

    Can you give an example of how DDD can coexist with microservices architecture?

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  • 30.

    What factors would influence the decision to refactor a legacy system with a DDD approach?

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Advanced DDD Concepts


  • 31.

    Explain how DDD principles can be applied at different scales in a software project.

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  • 32.

    How can DDD help in understanding and aligning complex organizational structures?

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  • 33.

    How does DDD assist in creating a pluggable component architecture?

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  • 34.

    How does DDD help manage distributed systems complexity, particularly in consistency management?

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  • 35.

    What are the challenges involved in implementing DDD in a large, multidisciplinary team?

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Practical Considerations


  • 36.

    What are common pitfalls when transitioning an existing project to DDD?

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  • 37.

    How do you measure the success of DDD implementation in a project?

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  • 38.

    What tools or frameworks are supportive of DDD and why?

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  • 39.

    How would you address the training and knowledge transfer needed for a team new to DDD?

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  • 40.

    Can you provide an example of a project where DDD provided clear benefits over other design approaches?

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