About the role
The mobile developer designs, develops and maintains mobile applications for smartphones and tablets. Specialised in native development (iOS with Swift, Android with Kotlin) or cross-platform (React Native, Flutter), they're at the heart of companies' digital transformation in the mobile-first era.
Their mission goes beyond simple coding: optimising performance, ensuring fluid user experience, managing push notifications, integrating third-party APIs (payments, geolocation, camera), and securing data.
The role evolves with cross-platform development emergence, on-device AI integration, SwiftUI and Jetpack Compose adoption. The job-to-candidate ratio remains above 2.5:1 with +10-15% salary increase versus 2024.
Mobile app development
Design and develop native apps (Swift/SwiftUI for iOS, Kotlin/Jetpack Compose for Android) or cross-platform (React Native, Flutter). Implement business features per specification. Follow design guidelines (Human Interface Guidelines, Material Design).
API and service integration
Consume REST or GraphQL APIs. Integrate third-party SDKs (Firebase, Stripe, Google Maps). Manage authentication (OAuth, biometry). Implement caching and offline sync systems.
Performance optimisation
Reduce battery consumption and memory usage. Optimise load times and smoothness (60fps minimum). Manage threading and asynchronous tasks. Reduce binary size (APK/IPA).
Testing and quality
Write unit tests (XCTest, JUnit, Jest) and integration tests. Conduct automated UI testing (XCUITest, Espresso, Detox). Manual testing on various devices and OS. Use CI/CD tools (Fastlane, Bitrise, GitHub Actions).
App store publishing and maintenance
Manage publication on app stores (App Store, Google Play). Follow Apple and Google review processes. Monitor crashes (Crashlytics, Sentry) and fix production bugs. Analyse usage metrics.
Technology watch
Follow mobile OS evolution (iOS 18, Android 15). Test new APIs and frameworks. Adapt apps to new devices (foldable phones, wearables). Attend meetups and conferences.
Technical skills vs soft skills
- Mastery of a native language (Swift for iOS or Kotlin for Android)
- Expertise in a cross-platform framework (React Native, Flutter) for versatile profiles
- In-depth knowledge of mobile SDKs (UIKit, SwiftUI, Jetpack Compose)
- Mastery of mobile architectures (MVVM, MVI, Clean Architecture)
- Experience with REST/GraphQL APIs and state management
- Mobile security knowledge (keychain, encryption, obfuscation)
- Debugging and performance optimisation skills
- Rigour and attention to detail (pixel-perfect UI)
- Quick adaptation to new OS versions
- Product sense and user empathy
- Patience with app store review processes
- Communication and teamwork (with designers, backend, PMs)
- Curiosity and passion for mobile ecosystem
Native vs cross-platform comparison
Native (Swift/Kotlin) vs cross-platform (React Native/Flutter)
| Critère | Native (Swift/Kotlin) | Cross-platform (React Native/Flutter) |
|---|---|---|
| Performance | Maximum | Very good |
| Development cost | Double (iOS + Android) | Single codebase |
| Native API access | Complete and immediate | Via plugins/bridges |
| Time to market | Longer | Faster |
| Available candidates | Specialised, fewer | Larger pool |
Salary scale 2026
Mobile developer salaries by experience (gross annual)
| Experience | Startup/SME | Mid-size company | Tech companies | London/SE |
|---|---|---|---|---|
| Junior (0-2 years) | 36-43K EUR | 33-39K EUR | 38-46K EUR | +10-15% |
| Experienced (2-5 years) | 43-58K EUR | 40-50K EUR | 50-62K EUR | +10-15% |
| Senior (5-8 years) | 58-72K EUR | 52-62K EUR | 62-85K EUR | +15-20% |
| Lead / Head of Mobile (8+ years) | 68-95K EUR | 62-78K EUR | 78-110K EUR | +15-20% |
Training and careers
Becoming a mobile developer
| Level | Training | Outcomes |
|---|---|---|
| Bac+2 | BTEC Higher National Certificate, City & Guilds | Junior mobile developer with additional training |
| Bac+3 | Foundation Degree Mobile Dev, Bachelor Dev, Mobile bootcamp | Junior mobile developer |
| Bac+5 | BSc Computing, Engineering school (Imperial, UCL) | Senior mobile developer, lead mobile |
| Self-taught | Published apps + certifications + portfolio | All levels based on experience |
Career progression
Junior mobile developer
Feature development, bug fixes
Mobile developer
Full autonomy, complex features, mentoring juniors
Senior mobile developer
App architecture, technical decisions
Lead mobile developer
Mobile team leadership, technical strategy
Mobile architect / Head of Mobile
Overall mobile vision, governance
Frequently asked questions about mobile developers
Should we recruit a native or cross-platform developer?
React Native or Flutter in 2026: which to choose?
Can someone become a mobile developer without a diploma?
Should a mobile developer know backend?
What are the main challenges of mobile development?
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