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DD · iOS Prep

Your iOS
Interview Kit

Everything in one place. Tap any section to study, mark questions done, and add your own notes.

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Phone Screen
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Technical
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Behavioral
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System Design
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Interview Day Reminders
✦Always start your answer with the bottom line — what you did and what happened — then fill in context. Interviewers lose attention fast.
✦Use your Walmart and Macy's stories as much as possible. Real specifics (nTransit, geofencing, image compression, 100M+ users) land way better than generic answers.
✦For Swift/iOS theory, anchor it: "In my experience at Walmart..." — it shows you actually lived it, not just read it.
✦Behavioral questions: follow STAR loosely but don't be robotic. Just tell the story naturally and make sure you clearly say what you did.
✦It's okay to pause before answering. "Let me think about that for a second" is a sign of a senior engineer, not a weakness.
Phone Screen
HR & recruiter round — usually 20–30 min. Keep answers conversational and concise.
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Focus: background · motivation · fit
Technical Round
Core iOS & Swift knowledge. Sound practical — you've shipped real products, not just read docs.
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Focus: Swift · SwiftUI · Memory · Concurrency · Architecture
Behavioral Round
Tell real stories from your work. Specific details from Walmart and Macy's will carry these.
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Framework: STAR — but keep it human
Heads up: Scenario-based questions vary wildly by company and team. The questions below are common patterns — use them to practice your stories, and you'll be able to adapt on the fly. Your Outfitly project, the nTransit performance fix, and Macy's high-traffic features are your best material.
System Design
Mobile-focused architecture discussions. Think out loud — the process matters as much as the answer.
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Focus: architecture · offline · scalability · tradeoffs