iOS · 18 min
iOS interview questions in 2026, round by round
iOS interview questions for 2026, organised by round: Swift, concurrency, memory, SwiftUI, UIKit, architecture, system design, testing, coding and behavioural.
iOS · Answer practice
The 24-Hour iOS Interview Answer Book
Senior answer cards
Review the highest-frequency senior iOS interview questions and rehearse answers, follow-ups and recovery lines you can say out loud.
“Clear, practical, and worth keeping within reach.”
262 pages · 157 answer cards · Top 50 pushes and recovery lines · 5 full simulations
Mike Salari · Staff mobile engineer · 500+ technical interviews from the hiring side
Secure checkout on Gumroad.Instant PDF and EPUB download.Lifetime updates.
What is inside
The 24-Hour iOS Interview Answer Book in its own order: what each part teaches, so you can see whether it covers the round you have next.
- 01
Triage and paths
How to use the book in 24 hours, choosing a path by time left, the top 50 questions, the 15 senior-versus-mid questions and the 10 answers that can cost the offer.
- 02
Part 1 to 4: Swift core, Memory and ARC, Concurrency, SwiftUI
Value and reference semantics, retain cycles and weak versus unowned, Swift concurrency and SwiftUI state.
- 03
Part 5 and 6: Architecture and System design
Modularisation and app architecture, then the iOS system design interview.
- 04
Parts 7 to 13: Networking to release
Networking and auth, persistence and migrations, testing, performance, security, accessibility and localization, and CI/CD with code signing.
- 05
Parts 14 to 16: Live coding, behavioural, leadership
Live coding drills, behavioural answers and management and leadership questions.
- 06
Simulations and final review
Bad, good and great company answers, real mistakes, live simulations, a senior readiness scorecard and a final 30-minute review.
Is it the right book for you?
Who gets the most from it, and when a different book is the better use of your time. The last list is as important as the first.
Use it when
- Your iOS loop is close and you need answers you can say under follow-up pressure.
- You have one evening, one hour or only the morning and want a reading path for exactly that time.
- You expect Swift concurrency, SwiftUI or iOS system design questions and want the traps flagged in advance.
- You tend to sound memorized and want rehearsed recovery lines for when the interviewer pushes.
- You want answers checked against the Swift 6.4 and WWDC26 changes.
Skip it when
- You have weeks and need the full interview map first.
- You want hands-on live coding practice with a code repository; that is Share Your Screen.
- You are new to iOS and need to learn the platform.
- Your role is Android or React Native.
By level
- Mid
- The senior-versus-mid list and the short answers show what a mid-level answer is missing.
- Senior
- Senior answers, follow-ups and recovery lines give you the two-minute version for when the interviewer digs in.
- Lead
- The behavioural and leadership parts plus the readiness scorecard cover the judgement side of the loop.
- Staff
- System design and architecture cards plus the full simulations train the scope staff rounds test.
What a page looks like
A card opens with the question and tags for priority, frequency, level and round type. It gives a short answer, a one-line memory hook, often a comparison table, then the senior answer, why they ask, the common trap and follow-up questions with brief answers. The short answer is your 30-second version; the senior answer and follow-ups are the two-minute version.
The facts
- 262 pages
- 157 answer cards
- Top 50 pushes and recovery lines
- 5 full simulations
- Swift 6.4 and WWDC26 aware
- PDF and EPUB
- Lifetime updates
- Last updated 5 Aug 2026
- Levels: mid, senior, lead, staff
The Answer Card
What every answer card gives you
- 01Short Answer
The core point in a sentence or two, for when time is short.
- 02Senior Answer
The deeper version that shows senior judgement, in words you can say.
- 03Trap
The weak answer that sounds right and costs the point.
- 04Follow-up
The push an interviewer is likely to make next.
- 05Recovery
A line that gets you back on track when the push lands.
What readers wrote
★★★★★
A professionally written and genuinely useful book. It’s not just something to pick up when you need to quickly prepare for a technical interview; it’s a great resource to revisit from time to time to refresh your knowledge and reinforce key concepts. Clear, practical, and worth keeping within reach. Highly recommended.
★★★★★
I came to this book after reading iOS Blueprint and following Mike's advice. Honestly, this book helped me a lot. I had an interview this Monday and only had the weekend to refresh my knowledge. The technical round went well, and I was able to answer almost all of the questions confidently. The only area where I got stuck was explaining Sendable, which showed me where I still need more practice. The next book I'll probably buy is Share Your Screen, especially for the live coding preparation. Mike's approach is very clear, detailed, and easy to follow. The explanations focus on helping you truly understand the concepts rather than just memorizing answers. Thanks a lot for creating these resources, they were genuinely helpful during my interview preparation 👌
★★★★★
Amazing book
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Questions buyers ask
Short answers about The 24-Hour iOS Interview Answer Book, from the book itself and the store page.
What is inside?
157 answer cards in 16 parts over 262 pages, the top 50 pushes and recovery lines, and 5 full simulations. It comes as PDF and EPUB.
Do I read it cover to cover?
No. Pick the path for your time left: an evening, two hours, one hour or the morning of. Each path names what to read and in what order.
Is there a sample?
Yes, at salari.dev/sample/24-hour-ios-interview-answer-book-sample.pdf.
Is it current?
The technical claims were checked against Apple and Swift documentation in June 2026, and it is Swift 6.4 and WWDC26 aware. Updates are included with the purchase.
How does it differ from Share Your Screen?
This book is for the final day or two: cards you rehearse aloud. Share Your Screen is a longer training book for live coding, code review and take-home rounds with a companion Swift package.
What does it cost?
$89.
Where is it sold?
On Gumroad, at the price shown there ($89 when this page was built). Gumroad handles payment, the receipt and the download.