Swift Code Composer
Swift Technical Interview Prep
I've created this knowledge base and resources to help iOS engineers prepare for a staff/principle level technical interviews.
Common practical interview questions grouped by topic.
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Swift language features
Value vs reference, optionals, protocols, ARC, closures, errors, property wrappers, Sendable.
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Architecture & design patterns
MVVM, coordinators, DI, clean architecture.
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UIKit & SwiftUI internals
Lifecycle, responder chain, layout, collection view, SwiftUI state, interop.
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Concurrency
async/await, actors, structured concurrency, tasks, cancellation, GCD migration.
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Performance & optimization
Instruments, scrolling, memory, launch time, dispatch, images.
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Networking & data
URLSession, Codable, offline-first, pagination.
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Testing
XCTest, mocks, UI tests, async tests, snapshots, coverage.
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Data persistence
Core Data, SwiftData, Keychain, files, SQLite, migrations.
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System design & soft skills
Refactors, debt, reviews, onboarding, ambiguity, collaboration.