2026

DDD Interview Questions 2026

A current, 2026 snapshot of the DDD interview questions worth knowing — kept up to date as frameworks and best practices evolve, so you prepare with what companies are actually asking in 2026.

60Questions14Beginner13Intermediate33Senior

60 DDD questions

  1. 1What is 'Customer/Supplier' relationship in DDD?Intermediate
  2. 2What is the 'Anemic Domain Model' anti-pattern?Intermediate
  3. 3How do you handle 'Invariants' in an Aggregate?Intermediate
  4. 4What is an Application Service vs a Domain Service?Intermediate
  5. 5Explain the 'Shared Kernel' relationship.Intermediate
  6. 6What is a Factory in DDD?Intermediate
  7. 7What is an Anti-Corruption Layer (ACL)?Intermediate
  8. 8Explain the Context Map.Intermediate
  9. 9What is a Domain Event?Intermediate
  10. 10Explain the Aggregate Root and its responsibilities.Intermediate
  11. 11What is an Aggregate?Beginner
  12. 12What is a Repository in DDD?Beginner
  13. 13What is a Service in DDD?Beginner
  14. 14What is a Bounded Context?Beginner
  15. 15Difference between Entity and Value Object.Beginner
  16. 16What is a Value Object?Beginner
  17. 17What is an Entity in DDD?Beginner
  18. 18Explain the Ubiquitous Language.Beginner
  19. 19What is a Domain in DDD?Beginner
  20. 20What is Domain-Driven Design (DDD)?Beginner
  21. 21DDD Interview Question 3 (Free)Senior
  22. 22DDD Interview Question 2 (Free)Intermediate
  23. 23DDD Interview Question 1 (Free)Beginner
  24. 24DDD Interview Question 5 (Free)Intermediate
  25. 25DDD Interview Question 4 (Free)Beginner
  26. 26Domain-Driven Design for Frontend: Domain Logic in JS/TS.Senior
  27. 27DDD and Actor Model (Akka/Proto.Actor) synergy.Senior
  28. 28Integrating Third-Party APIs using the ACL pattern.Senior
  29. 29Refactoring toward Deeper Insight.Senior
  30. 30Dealing with External Identities in the Domain.Senior
  31. 31Advanced Value Object patterns: Smart Enums.Senior
  32. 32Conflict Resolution in Distributed Domain Models.Senior
  33. 33Open Host Service (OHS) and Published Language.Senior
  34. 34The 'Separate Ways' Strategic Pattern.Senior
  35. 35Side-Effect-Free Functions in Domain Modeling.Senior
  36. 36DDD and NoSQL: Modeling Aggregates in Document DBs.Senior
  37. 37Testing Strategy for DDD: Unit testing the Domain Model.Senior
  38. 38Clean Architecture vs Onion Architecture in DDD projects.Senior
  39. 39Hexagonal Architecture (Ports and Adapters) with DDD.Senior
  40. 40Snapshoting in Event Sourced Aggregates.Senior
  41. 41Versioning Domain Events in Event-Sourced Systems.Senior
  42. 42The Role of Policy and Specification Patterns in DDD.Senior
  43. 43Domain Prototyping and Whirlpool Process.Senior
  44. 44DDD in Serverless Architectures.Senior
  45. 45Handling Performance Bottlenecks in Large Aggregates.Senior
  46. 46Modeling Deep Insights: Moving from CRUD to Domain Discovery.Senior
  47. 47Implementing Transactional Outbox for Domain Events.Senior
  48. 48Advanced Context Mapping: Conformist vs Partnership.Senior
  49. 49DDD and Microservices: Mapping Bounded Contexts to Services.Senior
  50. 50Legacy System Migration using the Strangler Fig and ACL.Senior
  51. 51Designing for Eventual Consistency between Aggregates.Senior
  52. 52Saga Pattern for Long-Running Distributed Transactions.Senior
  53. 53CQRS and DDD: Separating Read and Write Models.Senior
  54. 54Implementing DDD with Event Sourcing.Senior
  55. 55Strategic Design vs Tactical Design in DDD.Senior
  56. 56DDD Advanced Interview Question 10Beginner
  57. 57DDD Advanced Interview Question 9Senior
  58. 58DDD Advanced Interview Question 8Intermediate
  59. 59DDD Advanced Interview Question 7Beginner
  60. 60DDD Advanced Interview Question 6Senior

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Frequently asked questions

Are these DDD interview questions up to date for 2026?

Yes. This page reflects 60 DDD interview questions kept current with today's frameworks, tooling and interview trends, with each answer maintained and dated.

What DDD topics should I focus on in 2026?

Prioritise the fundamentals plus the modern patterns interviewers ask about now. Each question here includes a detailed answer, code example and common mistakes so you can target the highest-impact areas.

Are these questions free?

You can read the question and a short answer for free. A subscription unlocks the full detailed explanation, real-world example, common mistakes and follow-up questions for each one.