2026

Design Patterns Interview Questions 2026

A current, 2026 snapshot of the Design Patterns 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 Design Patterns questions

  1. 1What is the Flyweight Pattern?Intermediate
  2. 2What is the Mediator Pattern?Intermediate
  3. 3What is the Chain of Responsibility Pattern?Intermediate
  4. 4What is the Iterator Pattern?Intermediate
  5. 5What is the Template Method Pattern?Intermediate
  6. 6What is the State Pattern?Intermediate
  7. 7What is the Command Pattern?Intermediate
  8. 8What is the Proxy Pattern?Intermediate
  9. 9What is the Builder Pattern?Intermediate
  10. 10What is the Abstract Factory Pattern?Intermediate
  11. 11What is the Adapter Pattern?Beginner
  12. 12What is the Facade Pattern?Beginner
  13. 13What is the MVC (Model-View-Controller) Pattern?Beginner
  14. 14What is the Decorator Pattern?Beginner
  15. 15Creational, Structural, and Behavioral patterns: What's the difference?Beginner
  16. 16What is the Strategy Pattern?Beginner
  17. 17What is the Observer Pattern?Beginner
  18. 18What is the Factory Method Pattern?Beginner
  19. 19What is the Singleton Pattern?Beginner
  20. 20What are Software Design Patterns?Beginner
  21. 21Design Patterns Interview Question 2 (Free)Intermediate
  22. 22Design Patterns Interview Question 5 (Free)Intermediate
  23. 23Design Patterns Interview Question 4 (Free)Beginner
  24. 24Design Patterns Interview Question 3 (Free)Senior
  25. 25Design Patterns Interview Question 1 (Free)Beginner
  26. 26What is the Double-Checked Locking Pattern?Senior
  27. 27What is the Lock Striping Pattern?Senior
  28. 28What is the Thread Pool Pattern?Senior
  29. 29What is the Reactor Pattern?Senior
  30. 30What is the MapReduce Pattern?Senior
  31. 31What is the Leader Election Pattern?Senior
  32. 32What is the Cache-Aside Pattern?Senior
  33. 33What is the Throttling Pattern?Senior
  34. 34What is the Sharding Pattern?Senior
  35. 35What is the Materialized View Pattern?Senior
  36. 36Dependency Inversion Principle (DIP) vs Dependency Injection (DI)?Senior
  37. 37Active Record vs Data Mapper Pattern?Senior
  38. 38Publisher-Subscriber (Pub/Sub) vs Observer Pattern?Senior
  39. 39What is an Anti-Corruption Layer (ACL)?Senior
  40. 40What is the Outbox Pattern?Senior
  41. 41What is the Rate Limiting Pattern?Senior
  42. 42What is the Retry Pattern?Senior
  43. 43Dependency Injection (DI) vs Service Locator Pattern?Senior
  44. 44What is the Unit of Work Pattern?Senior
  45. 45What is the Repository Pattern in Domain-Driven Design (DDD)?Senior
  46. 46What is the Bulkhead Pattern?Senior
  47. 47What is the Ambassador Pattern?Senior
  48. 48What is the Sidecar Pattern?Senior
  49. 49What is the API Gateway Pattern?Senior
  50. 50What is the Strangler Fig Pattern?Senior
  51. 51What is the Circuit Breaker Pattern?Senior
  52. 52Explain the Saga Pattern in Microservices.Senior
  53. 53What is the Event Sourcing Pattern?Senior
  54. 54Explain the CQRS (Command Query Responsibility Segregation) Pattern.Senior
  55. 55What are Architectural Anti-patterns?Senior
  56. 56Design Patterns Advanced Interview Question 10Beginner
  57. 57Design Patterns Advanced Interview Question 9Senior
  58. 58Design Patterns Advanced Interview Question 8Intermediate
  59. 59Design Patterns Advanced Interview Question 7Beginner
  60. 60Design Patterns Advanced Interview Question 6Senior

Explore more Design Patterns interview questions

By Level

By Experience

Or browse all Design Patterns interview questions.

Frequently asked questions

Are these Design Patterns interview questions up to date for 2026?

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

What Design Patterns 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.