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Senior iOS Interview: The Complete Guide (2026 Edition)
235 Q&A on Architecture, Swift 6, SwiftUI & System Design
This book is 100% completeLast updated on 2026-11-06
235 scenario-based senior iOS interview questions with detailed answers, Swift 6 code and trade-off tables, fully updated for Swift 6.2, iOS 26 and iOS 27. Built for senior developers, tech leads and architects.
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About the Book
Senior iOS Interview: The Complete Guide is built for experienced iOS developers, tech leads and architects who want to do well in senior-level interviews and show real architecture, system design and leadership expertise. 235 scenario-based questions with detailed answers, Swift 6 code, trade-off tables and ready-to-say "Interview Tips" throughout. Fully updated for Swift 6.2, iOS 26 and iOS 27. What's inside (13 sections): Architecture & Design Patterns: MVVM, VIPER, Clean, TCA, DI, coordinators (Q1–15) Concurrency & Performance: async/await, actors, Mutex, profiling (Q16–30) Networking & Data Layer: typed endpoints, token refresh, pagination, caching (Q31–45) Swift & Framework Mastery: macros vs property wrappers, Sendable, ARC, CoW (Q46–61) App Lifecycle, Testing & CI/CD: Swift Testing, Xcode Cloud, Fastlane, signing (Q62–75) System Design for iOS: a 5-step framework, offline sync, push, background tasks (Q76–85) Leadership, Mentorship & Collaboration (Q86–95) SwiftUI Advanced Topics: Observation, performance, layout, animation, navigation (Q96–160) SwiftData, Core ML & Vision: migrations, @ModelActor, the Swift Vision API (Q161–180) ARKit, RealityKit & Spatial Computing: RealityView, visionOS (Q181–190) Leadership & Architectural Decision-Making: ADRs, standards, metrics (Q191–200) Real-World Pain Points & Scenarios: SDK crashes, slow CI, legacy modernization (Q201–215) What's New in 2026: Swift 6, Apple Intelligence, Foundation Models, App Intents, Liquid Glass, iOS 26 & 27 (Q216–235) Answers include clear concept explanations, Swift 6 code, architecture diagrams, trade-off and comparison tables, ready-to-say "Interview Tips", and "2026 Update" notes where things changed. Also included: a 4-week study plan, a one-week sprint plan, and a system-design answer framework. Perfect for senior iOS developers preparing for Lead / Architect roles, candidates targeting FAANG and top product companies, and engineers strengthening system design and architecture decision-making. Format: PDF, 180 pages, 13 sections, 235 questions, with clickable contents and bookmarks. Free sample: download it to read all of Section 1 (Architecture & Design Patterns) plus excerpts from System Design and What's New in 2026 before you buy.
About the author: Puneet Shah is a Senior iOS Engineer with 12+ years of experience. Also by the author: The Ultimate iOS Developer Interview Handbook, 620 questions from Objective-C to Swift 6 (leanpub.com/ultimate-ios-interview-handbook), and AI for Senior iOS Engineers: The Interview Guide (leanpub.com/ai-ios-interview-guide).
Author
About the Author
Puneet Shah
Puneet Shah is a senior iOS engineer with 12+ years of experience building production apps in Swift and Objective-C. He currently works at a leading MNC on a large-scale consumer iOS app. He writes practical, up-to-date interview guides for mobile engineers, focused on what interviewers ask in senior, lead and architect rounds. His books cover Swift 6, SwiftUI, Objective-C, mobile system design and, most recently, building AI features on Apple platforms.
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