Interview Questions for an iOS Developer
Interview an iOS developer by testing Swift fluency, app architecture, concurrency, and platform craft against Apple's guidelines. Probe how they structure testable code, optimize startup and frame rate with Instruments, handle offline persistence, and manage App Store releases. Strong candidates write clean, maintainable native code, profile rather than guess, and ship polished interfaces that respect the platform.
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Run this as a Swift and architecture conversation with practical, platform-specific depth rather than generic algorithm puzzles. Ask candidates to walk through an app they built and shipped, and probe their choices around architecture, concurrency, persistence, and performance. The strongest iOS developers profile with Instruments instead of guessing, follow the Human Interface Guidelines, and handle code signing and the App Store review process confidently.
Technical & Role-Specific
What to look for: Separates view, presentation, and business logic, makes dependencies injectable and mockable, and explains how the structure keeps the feature testable and the UI thin.
What to look for: Understands structured concurrency, actors and the main actor, avoiding data races, and chooses the right tool for the job rather than reaching for one pattern reflexively.
What to look for: Designs a local source of truth, sync and conflict handling, background contexts, and graceful behavior when the network is unavailable.
What to look for: Profiles startup, main-thread work, and frame drops with Time Profiler and other instruments, finds real bottlenecks like blocking work or retain cycles, and fixes based on data.
What to look for: References platform conventions, accessibility, dynamic type, safe areas, and standard controls and gestures rather than reinventing platform behavior.
What to look for: Comfort with provisioning, certificates, schemes and configs, and the review and release process, ideally with CI/CD automating builds.
Behavioral & Past Experience
What to look for: Clear ownership, real technical decisions, and an understanding of the full release lifecycle, not just feature coding.
What to look for: Used Instruments and a hypothesis-driven approach, found the root cause such as a retain cycle or main-thread blockage, and verified the fix.
What to look for: Reads crash reports, reproduces and isolates the cause, ships a targeted fix, and uses monitoring to confirm resolution.
What to look for: Improved architecture and testability incrementally, justified the refactor, and avoided breaking behavior, ideally backing it with tests.
What to look for: Handles deprecations, tests across versions and devices, and balances adopting new APIs against supporting existing users.
Situational & Problem-Solving
What to look for: Adds appropriate caching, retries with backoff, graceful error states and offline fallback, and a good user experience when the network misbehaves.
What to look for: Profiles cold and warm starts, defers non-essential work off the launch path, reduces main-thread blocking, and measures the improvement with Instruments.
What to look for: Reads the rejection against the guidelines, addresses the real issue, communicates with review if needed, and resubmits without guessing or arguing blindly.
What to look for: Local source of truth, change tracking, a sync and conflict-resolution strategy, and clear UI states for syncing and errors.
What to look for: Reasons about state and view identity, isolates the state driving the issue, uses previews and debugging tools, and forms a testable hypothesis.
Collaboration & Culture
What to look for: Translates designs faithfully while applying platform conventions and accessibility, and pushes back constructively where designs fight the platform.
What to look for: Reviews for correctness, architecture, testability, and platform best practices, gives constructive feedback, and values shared conventions.
What to look for: Weighs minimum supported versions, stability, and user impact, and avoids chasing novelty at the cost of reliability.
What to look for: Uses crash monitoring, automated tests, CI/CD, and staged rollouts, treating quality as continuous rather than a final gate.
iOS Developer interview scorecard
Score every candidate on the same criteria, immediately after the interview, using evidence you actually heard rather than an overall impression. Agree the criteria with the panel before the first interview — deciding what counts after you have met people is how the loudest interviewer wins the debrief.
| Criterion | Evidence to record | Score 1-5 |
|---|---|---|
| Technical & Role-Specific | What the candidate actually said or did, in their own example — not your impression of it | 1 2 3 4 5 |
| Behavioral & Past Experience | What the candidate actually said or did, in their own example — not your impression of it | 1 2 3 4 5 |
| Situational & Problem-Solving | What the candidate actually said or did, in their own example — not your impression of it | 1 2 3 4 5 |
| Collaboration & Culture | What the candidate actually said or did, in their own example — not your impression of it | 1 2 3 4 5 |
| Overall recommendation | Strong no / no / mixed / yes / strong yes, with the single reason that decided it | - |
Want this as a reusable document? Use the interview scorecard template.
Questions to avoid asking a iOS Developer
Exactly which questions are unlawful depends on where you are hiring, and the rules change — so treat this as the list of topics to route through your own employment counsel, not as a legal standard. The practical test that holds everywhere: if the answer could not change how the person does this job, you have no reason to ask it.
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