Experienced (3+ years)

iOS Interview Questions for Experienced Professionals

For developers with a few years of iOS under their belt, these 85 questions go beyond the basics into the architecture, performance and decision-making that experienced interviews focus on.

85Questions13Intermediate72Senior

85 iOS questions

  1. 1What is MVVM architecture?Intermediate
  2. 2What are notifications in iOS?Intermediate
  3. 3Weak vs Unowned referencesIntermediate
  4. 4What is SwiftUI?Intermediate
  5. 5What is URLSession in iOS?Intermediate
  6. 6What is Codable in Swift?Intermediate
  7. 7How does error handling work in Swift?Intermediate
  8. 8What are extensions in Swift?Intermediate
  9. 9What are protocols in Swift?Intermediate
  10. 10What are closures in Swift?Intermediate
  11. 11iOS Interview Question 5 (Free)Intermediate
  12. 12iOS Interview Question 3 (Free)Senior
  13. 13iOS Interview Question 2 (Free)Intermediate
  14. 14How do you design testable architecture in iOS at enterprise scale?Senior
  15. 15How do you design a scalable deep linking architecture in iOS?Senior
  16. 16How do you design a multi-layer data flow architecture in iOS?Senior
  17. 17How do you design a resilient networking architecture with retries, circuit breakers, and fallbacks?Senior
  18. 18How do you design a domain-driven architecture in iOS?Senior
  19. 19How do you design a plugin-based feature toggle system in iOS architecture?Senior
  20. 20How do you design a scalable caching architecture for offline-first iOS apps?Senior
  21. 21What is state machine architecture in iOS and when should you use it?Senior
  22. 22How do you design a reactive architecture in iOS using Combine at scale?Senior
  23. 23How do you scale iOS architecture across multiple teams (monorepo strategy)?Senior
  24. 24How do you design persistence architecture in iOS applications?Senior
  25. 25How should networking architecture be designed in iOS apps?Senior
  26. 26How do you design navigation architecture in large iOS apps?Senior
  27. 27What is plugin-based architecture in iOS?Senior
  28. 28How does offline-first architecture work in iOS apps?Senior
  29. 29What is CQRS architecture and how can it be applied in mobile apps?Senior
  30. 30How do you design event-driven architecture in iOS apps?Senior
  31. 31What is Hexagonal Architecture (Ports and Adapters) in iOS?Senior
  32. 32How does The Composable Architecture (TCA) work in large iOS apps?Senior
  33. 33How do you handle cross-feature communication in modular iOS apps?Senior
  34. 34What is caching architecture in iOS apps?Senior
  35. 35How does unidirectional data flow architecture work in iOS?Senior
  36. 36What is feature modularization in iOS architecture?Senior
  37. 37How do you design dependency injection at scale in iOS apps?Senior
  38. 38What is the Repository pattern in iOS architecture?Senior
  39. 39How do you manage state in large-scale iOS applications?Senior
  40. 40What is Clean Architecture in iOS and how do you implement it at scale?Senior
  41. 41Explain MVVM-C architecture and why it is used in large iOS appsSenior
  42. 42How do you design a scalable iOS architecture for large applications?Senior
  43. 43Advanced debugging techniques in iOS (LLDB and Instruments)Senior
  44. 44How to design modular iOS applications?Senior
  45. 45What causes deadlocks in iOS threading?Senior
  46. 46How does Core Animation improve performance?Senior
  47. 47What is SSL pinning in iOS?Senior
  48. 48How does Objective-C interoperability work in Swift?Senior
  49. 49What is Swift runtime and reflection?Senior
  50. 50What is RunLoop in iOS?Senior
  51. 51What is Clean Architecture in iOS?Senior
  52. 52What are SOLID principles in iOS development?Senior
  53. 53How to improve iOS app startup performance?Senior
  54. 54What is Swift Package Manager (SPM)?Senior
  55. 55What is a dependency injection container?Senior
  56. 56What is the Coordinator pattern in iOS?Senior
  57. 57What are Universal Links in iOS?Senior
  58. 58How does background processing work in iOS?Senior
  59. 59How to optimize UITableView and UICollectionView performance?Senior
  60. 60How does ARC lead to retain cycles?Senior
  61. 61What is TaskGroup in Swift concurrency?Senior
  62. 62What is backpressure in Combine?Senior
  63. 63How to debug crashes in iOS apps?Senior
  64. 64How to scale iOS apps for large teams?Senior
  65. 65What is API pagination?Senior
  66. 66How to secure iOS apps?Senior
  67. 67What is Keychain in iOS?Senior
  68. 68How do push notifications work?Senior
  69. 69What is code signing in iOS?Senior
  70. 70What is snapshot testing?Senior
  71. 71What is unit testing in iOS?Senior
  72. 72What is CI/CD in iOS development?Senior
  73. 73How to handle race conditions in iOS?Senior
  74. 74What is Core Data concurrency?Senior
  75. 75What is diffable data source?Senior
  76. 76What are Instruments in Xcode?Senior
  77. 77How to detect memory leaks in iOS?Senior
  78. 78What is Combine framework?Senior
  79. 79What are actors in Swift?Senior
  80. 80Explain async/await in SwiftSenior
  81. 81What is dependency injection in iOS?Senior
  82. 82What is MVC architecture in iOS?Senior
  83. 83iOS Advanced Interview Question 9Senior
  84. 84iOS Advanced Interview Question 8Intermediate
  85. 85iOS Advanced Interview Question 6Senior

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Frequently asked questions

Which iOS questions do experienced (3+ years) get asked?

This page collects 85 iOS interview questions aligned with experienced (3+ years), ranging across the difficulty levels that match that experience band.

How do I prepare for a iOS interview with my experience level?

Work through these questions in order, make sure you can explain each answer out loud, and pay attention to the real-world examples and follow-ups — interviewers at this level care as much about reasoning as the final answer.

Do the answers include code and examples?

Yes — answers include explanations, code examples where relevant, common mistakes to avoid and follow-up questions so you are ready for the full interview conversation.