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Architecture
iOS architecture interview questions
Architecture rounds test judgment, not pattern trivia. Interviewers want to see how you reason about structure, testability, and change over time. This overview links the deep dives.
What architecture questions cover
Expect patterns like MVC, MVVM, VIPER, and unidirectional state, dependency injection, modularization and boundaries, and how you keep a large codebase testable and buildable. Questions are usually applied: structure this feature, make this class testable, or justify splitting this app into modules.
Answering with judgment
Avoid pattern tribalism. Explain that architecture is about managing dependencies and change, choosing the simplest structure that keeps code testable and features independent. Name the trade-offs of each choice, and be willing to say a heavy pattern is overkill for a small app. That pragmatism, over reciting VIPER diagrams, is the senior signal.
Go deeper than a summary
Share Your Screen works topics like this through in full: 75 solved Swift problems with tests, 9 real case studies, and 7 annotated mock interviews, so you rehearse the live round instead of just reading about it.
Frequently asked
What architecture do iOS interviews expect?
No single one. They expect you to reason about trade-offs among MVVM, unidirectional state, and others, and to justify choices around testability and change.
How do I avoid sounding dogmatic about architecture?
Frame it as managing dependencies and change, pick the simplest fit, and name trade-offs rather than defending one pattern as universally correct.