Senior iOS Interview Handbook

Walk into your senior iOS interview knowing that every answer you studied is correct.

Most interview prep material mixes solid advice with half-remembered details, outdated APIs, and confident guesses. The Senior iOS Interview Handbook takes a different approach. Every technical statement in this book was checked against its sources before it was written, and every one of its 114 code examples was compiled exactly as printed. What you study here is what you can say in an interview.

Senior interviews don't stop at definitions. They ask about trade-offs, failure modes, and how you would evolve a real codebase. Across 17 chapters, this handbook covers Swift Concurrency and its failure modes (actor reentrancy, main-actor hop costs, thread pool starvation, Swift 6 migration), memory management, SwiftUI state, networking and persistence, schema migration in SwiftData and Core Data, performance, architecture patterns and how to justify them at scale, modularization and linking trade-offs, testing, security, accessibility, CI/CD, push notifications and background work, App Store release management, dependency injection, and senior-level system design scenarios.

Every chapter includes clear explanations, working Swift code examples, interview questions to rehearse, and design-oriented exercises.

Whether you are targeting a senior, staff, or lead iOS role, this handbook helps you replace guesswork with answers you can defend.