Interviews Analyzed
2,847
What iOS engineers are actually asked in interviews.
Based on 2,847 real interview reports from iOS engineers at top tech companies.
Average Prep Time
12weeks
foundations
deep
system
polish
Offers Landed
72%
Among candidates following the plan
Avg Salary Bump
+$38k
Pre-offer vs post-offer base + equity
We pull jobs from sources most job seekers never check
01 — Companies
What top companies emphasize.
Interview focus varies significantly between company types and their mobile development needs.
FAANG
HighApple · Meta · Google · Amazon
100%
- Algorithms 45%
- System design 35%
- Behavioral 20%
Heavy emphasis on algorithms and mobile system design. Expect complex data structure problems and app architecture discussions.
AlgorithmsMobile Architecture
FINTECH
Medium-HighSquare · Stripe · Robinhood · Coinbase
100%
- Algorithms 30%
- System design 40%
- Behavioral 30%
Focus on secure mobile architecture, payment flows, and real-time data handling. Strong emphasis on system design.
SecurityReal-time Systems
EARLY-STAGE · SERIES A-B
MediumVarious startups · scale-ups
100%
- Algorithms 25%
- System design 25%
- Behavioral 25%
- Domain / fit 25%
Balanced approach with strong focus on shipping features quickly and adapting to changing requirements.
Product FitRapid Development
02 — Topics
Most frequently tested topics
68% of interviews containing topic
01
Swift Fundamentals
85%optionals, protocols, generics, closures, memory management
Core Swift language features and iOS-specific patterns
02
UIKit & Interface Design
78%view controllers, auto layout, table views, collection views, animations
User interface components and layout management
03
Data Structures & Algorithms
72%arrays, linked lists, trees, sorting, searching
Classic computer science problems adapted for mobile context
04
Networking & APIs
65%URLSession, JSON parsing, REST APIs, error handling, async programming
Network communication and data fetching patterns
05
Architecture Patterns
58%MVC, MVVM, VIPER, dependency injection, coordinator pattern
App architecture and design pattern implementation
06
Core Data & Persistence
45%Core Data, SQLite, UserDefaults, Keychain, file management
Data storage and persistence mechanisms
03 — Interview loop
Typical iOS engineer interview process
System design rounds often become the bottleneck, where candidates struggle with mobile-specific architecture decisions and scalability considerations.
Pass-rate funnel
Phone Screen · 78%
Technical Coding · 65%
iOS System Design · 42%
iOS Deep Dive · 58%
Behavioral · 72%
Offer rate compounded ≈ 1.3%
01
Phone Screen
30-45 min · pass 78%
Swift basics, iOS fundamentals, and simple coding problems
02
Technical Coding
CRITICAL60 min · pass 65%
Live coding in Swift, data structures, and algorithm problems
03
iOS System Design
most candidates fail60 min · pass 42%
Mobile app architecture, scalability, and iOS-specific design decisions
04
iOS Deep Dive
45-60 min · pass 58%
Advanced iOS topics, frameworks, and platform-specific knowledge
05
Behavioral
45 min · pass 72%
Leadership, collaboration, and past project discussions
04 — Question bank
Real questions you'll encounter.
Curated from actual iOS engineer interviews at top companies
SWIFT FUNDAMENTALS
Easy → MediumOptional binding
- nil coalescing
- guard statements
- optional chaining
- force unwrapping
DATA STRUCTURES
MediumBinary tree traversal
- level order
- inorder traversal
- tree validation
- lowest common ancestor
UIKIT COMPONENTS
MediumCustom table view
- cell reuse
- dynamic heights
- section headers
- pull to refresh
NETWORKING
Medium → HardAPI client design
- URLSession wrapper
- error handling
- retry logic
- request cancellation
ARCHITECTURE
HardMVVM implementation
- data binding
- view model testing
- coordinator pattern
- dependency injection
PERFORMANCE
HardMemory optimization
- retain cycles
- weak references
- image caching
- background processing
892 questions in the bank
Open the full bank →05 — Prep roadmap
12-week preparation roadmap
Structured path from Swift fundamentals to advanced iOS system design, optimized for interview success.
Hours / week
Total: 78 hrs
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
Weeks 1-3
5 hrs/wk
Swift & iOS Foundations
Master Swift syntax, optionals, protocols, and basic UIKit components. Build confidence with fundamental iOS concepts.
SwiftUIKitXcodeFundamentals
Weeks 4-7
7 hrs/wk
Data Structures & Algorithms
Practice coding problems in Swift context. Focus on arrays, strings, trees, and common algorithm patterns asked in iOS interviews.
AlgorithmsData StructuresProblem SolvingSwift Practice
Weeks 8-10
7 hrs/wk
iOS System Design
Learn mobile architecture patterns, networking design, data persistence strategies, and scalability considerations for iOS apps.
ArchitectureSystem DesignNetworkingCore Data
Weeks 11-12
7 hrs/wk
Mock Interviews & Polish
Practice complete interview loops, refine explanations, and polish behavioral responses. Focus on communication and presentation.
Mock InterviewsCommunicationBehavioralFinal Prep
06 — Tools & resources
Tools & resources that work.
Battle-tested by candidates who landed offers.
Mix of free + premium.
InterviewPal
Guided interview prep with mentorship and structured paths.
Best for: Structured prep
Visit InterviewPal
LeetCode
2,000+ coding problems. Premium unlocks company-tagged sets.
Best for: Algorithms & DS
Visit LeetCode
System Design Primer
Free comprehensive guide. The de-facto starting point.
Best for: SD fundamentals
Visit System Design Primer
Blind
Anonymous tech community. Real interview experiences and insights.
Best for: Real signal
Visit Blind
Levels.fyi
Salary and interview data, by company and level.
Best for: Company intel
Visit Levels.fyi
Pramp
Peer mock interviews. Live practice with real people.
Best for: Live practice
Visit PrampFrequently Asked Questions
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