How to Hire a Mobile Engineer
Mobile engineers build the app that lives in your users' pockets — the most personal and frequently used interface your product has. Great mobile engineers combine platform expertise with a deep understanding of performance constraints, offline behavior, and user expectations on mobile.
What to Look For
- Platform depth: Swift/SwiftUI for iOS, Kotlin/Jetpack Compose for Android, or React Native for cross-platform
- Understanding of mobile-specific constraints: battery, memory, network variability, and offline-first design
- App Store submission experience — including review guidelines and rejection handling
- Strong UX sensibility: mobile patterns differ significantly from web
- Experience with push notifications, deep linking, and background processing
- CI/CD for mobile: fastlane, Bitrise, or similar tooling
The Hiring Process
- 1
Platform knowledge screen
Cover lifecycle management, memory management, and one UI layout question specific to the platform you're hiring for.
- 2
Code sample review
Ask for a recent app they've shipped or a code sample. Evaluate architecture patterns (MVVM, Clean Architecture) and testability.
- 3
Live coding or take-home
Build a small feature on the target platform. Evaluate for idiomatic code, error handling, and attention to UI detail.
- 4
Performance and debugging interview
Walk through how they'd diagnose a slow scroll, a memory leak, or an app crash. Process and tooling matter here.
Interview Tips
- Ask 'How do you handle API failures in a mobile app when the user is offline?' — tests offline-first thinking
- Ask them to walk you through an app they've shipped and explain the hardest technical challenge
- Probe on App Store dynamics: 'How do you manage multiple app versions in the wild?'
- Ask about their approach to UI testing and snapshot testing
Red Flags
- Builds mobile apps like web apps — no awareness of performance constraints or platform conventions
- No experience with crash reporting tools (Crashlytics, Sentry) or analytics
- Has never shipped a public app — side projects count, but there should be something live
- Dismisses platform-specific guidelines or 'doesn't care about design system'
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