💻 Tech

iOS Developer — CV Example

Build world-class native apps for iPhone and iPad

What Does a iOS Developer Actually Do?

iOS Developers design and build native applications for Apple's iPhone and iPad platforms using Swift, SwiftUI, and UIKit. They work within engineering teams at companies like Spotify, Revolut, and Stripe, typically reporting to a Tech Lead or Engineering Manager. Day-to-day responsibilities include writing clean Swift code, architecting features using MVVM or Clean patterns, integrating APIs with async/await, testing with XCTest, and shipping updates via App Store Connect. Strong iOS developers balance performance optimization, user experience, and maintainability while managing dependencies like Combine, Core Data, and third-party frameworks.

James Mitchell

Senior iOS Developer

📍 London, UK✉️ james.mitchell@email.com

Summary

Senior iOS Developer with 6+ years building high-performance native apps using Swift, SwiftUI, and async/await. Led architecture redesign at Spotify reducing app load time by 40%. Expert in App Store deployment, Combine framework, and scaling mobile solutions for millions of users.

Work Experience

Senior iOS Developer at SpotifyMar 2022 — Present

Architected SwiftUI-based music streaming UI, improving frame rate from 45fps to 60fps for 12M+ users
Migrated legacy UIKit codebase to async/await, reducing memory leaks by 35% and crash rate by 28%

iOS Developer at RevolutJun 2020 — Mar 2022

Built payment transaction module in Swift, handling 500K+ daily transactions with 99.9% uptime
Implemented biometric authentication using LocalAuthentication, increasing security adoption by 67%

Skills

Swift & SwiftUIUIKit & StoryboardsCombine Frameworkasync/awaitApp Store & TestFlightCore Data & RealmNetwork Programming (URLSession)Git & CI/CDUnit Testing & XCTestMVVM & Clean Architecture

What Recruiters Look For

Recruiters prioritize demonstrable expertise in Swift and modern iOS frameworks (SwiftUI, async/await, Combine). They want to see shipped apps on the App Store with real user metrics—downloads, retention, crash-free rates. Code quality matters: clean architecture patterns (MVVM, Clean), unit test coverage, and dependency injection show maturity. Performance optimization experience is valuable, especially for consumer apps (startup time, memory, battery). Leadership potential appears through mentoring junior developers, code reviews, and technical decision-making. GitHub portfolios with well-documented projects and open-source contributions stand out. Finally, understanding of App Store guidelines, release processes, and App Store Connect add credibility.

Key Skills to Include

Core technical skills: Swift, SwiftUI, UIKit, Combine, async/await, Core Data, URLSession/networking. Essential frameworks: LocalAuthentication, AVFoundation, CoreLocation, MapKit depending on app type. Development tools: Xcode, Git, fastlane, CocoaPods/SPM. Testing & quality: XCTest, unit testing, debugging with Instruments (Core Animation, Memory Graph), App Store Connect/TestFlight. Architecture patterns: MVVM, Clean Architecture, Reactive Programming. Soft skills: code review mentality, cross-functional collaboration with designers and backend teams, ability to estimate and communicate timelines. If you have experience with analytics (Firebase, Mixpanel), CI/CD, or mobile security, highlight it—these differentiate senior candidates.

Common Mistakes

Avoid listing generic skills like 'teamwork' or 'communication'—show them through quantified achievements instead. Don't claim expertise in frameworks you haven't shipped in production; interviewers will probe depth. Resist the urge to list outdated tech (Objective-C unless specifically relevant, or deprecated APIs). Never exaggerate performance improvements without context—saying 'improved performance' means nothing without a metric (e.g., '40% faster startup'). Don't skip mentioning app version compatibility requirements; specify 'iOS 14+' or 'iOS 15+ only' to show you understand platform constraints. Finally, avoid vague bullet points like 'worked on the app'—always state what you built, how, and what the user impact was.

Formatting Tips

Keep bullets to 12-20 words max; they should scan in 3 seconds. Start every bullet with a strong action verb: 'architected', 'optimized', 'shipped', 'migrated', not 'worked on' or 'responsible for'. Always include numbers: memory reduction %, frame rate improvements, user reach, crash rate drops, release timelines. Use consistent date formatting (e.g., 'Mar 2022') and spell out company names fully. Organize experiences reverse-chronologically, most recent first. For skills, group logically: 'Languages & Frameworks' (Swift, SwiftUI, UIKit), 'Tools & Infrastructure' (Xcode, Git, fastlane), 'Architecture & Patterns' (MVVM, Combine). Keep your CV to one page if you have <5 years experience; two pages is acceptable for senior roles. Use a modern, clean template—fancy formatting distracts from content.

Average Salary — iOS Developer

United States

$125,000 – $185,000

United Kingdom

£75,000 – £120,000

Germany

€75,000 – €110,000

UAE / Dubai

$110,000 – $165,000

Canada

CAD $100,000 – $155,000

Australia

AUD $125,000 – $180,000

Figures in USD. Ranges reflect mid-level experience (3–7 years). Senior roles and major metro areas typically sit at the top of these bands.

Top 5 Interview Questions — iOS Developer

1Walk us through how you migrated a UIKit screen to SwiftUI. What challenges did you face?

In my role at Spotify, I led the migration of our legacy music player UIKit screen to SwiftUI. The main challenge was managing complex state across multiple reactive bindings. I used the MVVM pattern with an ObservableObject ViewModel and @Published properties to maintain separation of concerns. The tricky part was handling animations and gestures—UIViewRepresentable bridges helped. We tested extensively with XCTest and deployed gradually via feature flags to 10% of users first. The result: cleaner code, better performance, and easier maintenance for 8 developers on the team.

2Explain how async/await improves upon completion handlers and Combine for networking.

Async/await provides a linear, synchronous-looking syntax that's far easier to read than nested completion handlers or Combine chains. With completion handlers, error handling and sequencing become hard to follow—'callback hell' quickly becomes unmanageable. Combine is powerful but has a learning curve and can be overkill for simple sequences. Async/await, introduced in iOS 15, lets you write code that looks sequential: let data = try await fetchUser(). It integrates seamlessly with URLSession, supports cancellation via Task.isCancelled, and makes error handling natural with try/catch. I've used it at Revolut for payment processing—it reduced cognitive load and made unit testing significantly simpler.

3How do you approach app performance optimization when users report slowness?

I start with Xcode's Instruments—specifically Core Animation for frame drops, Memory Graph for leaks, and System Trace for thread contention. At Spotify, we identified that rendering expensive SwiftUI views on every state change was causing 45fps drops. I profiled the View hierarchy, identified unnecessary recomputes using @State vs @EnvironmentObject wisely, and applied .equatable() and .id(_:) modifiers strategically. I also enabled lazy loading for off-screen content. For networking slowness, I measure with Network framework to catch DNS/SSL delays. The key: measure first, hypothesize second, then optimize. Never optimize blind.

4Describe your experience with App Store deployment and managing multiple environments (Dev, Staging, Prod).

At Revolut, I managed app releases across three environments using build configurations and schemes in Xcode. Dev connected to a local backend, Staging to a QA server, and Prod to live APIs. I used environment variables and Info.plist to switch API endpoints and feature flags. For App Store releases, I managed versioning, built archives via Xcode or fastlane, uploaded via App Store Connect, and coordinated TestFlight beta testing with 50+ internal testers. I implemented semantic versioning and maintained a detailed release notes template. CI/CD pipelines (GitHub Actions) automated archive uploads, and I coordinated with QA for regression testing before public release.

5What's your experience with Core Data or Realm for local persistence?

I've used Core Data extensively at Spotify for caching downloaded music metadata and user preferences. Core Data offers strong iOS integration and iCloud sync support, but it has a steep learning curve—NSFetchRequest syntax, managed object contexts, and migration strategies require care. At Revolut, I evaluated Realm as a lighter alternative and integrated it for transaction history caching; it's simpler, faster for reads, but less suited for complex relationships. My approach: use Core Data for apps needing iCloud sync or complex relational data; use Realm for high-performance, write-heavy caching. Always implement proper error handling and test migrations thoroughly before releasing major schema changes.

How to Tailor Your CV

Top tech companies hiring iOS Developers include Spotify (music streaming requiring high performance), Revolut (fintech needing secure, fast payment flows), Stripe (payments SDK with strict quality standards), Meta (scale to billions), and Booking.com (travel apps with complex state). For Spotify, emphasize performance optimization and audio framework experience. For Revolut/Stripe, highlight security, authentication, and regulatory compliance knowledge. Booking.com values rapid iteration and A/B testing infrastructure. Meta wants scale experience and reactive architecture. Tailor your bullets to their tech stack: mention Combine if they use it, SwiftUI if they've modernized, async/await if iOS 15+ is their baseline. Research their open-source contributions and engineering blog.

Ready to build yours?

Use this template or start from scratch — our AI builder will guide you.