Senior Mobile Application Developer – iOS (Contract)

About the role

We are seeking a Senior iOS Developer to support and enhance a global client’s mobile application. The role focuses on bug fixes, feature development, and performance optimisation across multiple market roll‑outs, ensuring a stable and high‑quality user experience.

Key responsibilities

• Develop new features, resolve bugs and improve performance for the iOS app.
• Maintain real‑time communication with backend services and ecosystem partners.
• Implement and manage B2C registration/login flows via WebView and OAuth.
• Set up structured logging, analytics and crash reporting using Firebase tools.
• Optimise app launch time, memory usage and network efficiency.
• Ensure UI consistency with the client’s Figma design system.
• Collaborate with QA to validate fixes and automate regression tests.
• Handle network calls, caching, offline support and multi‑environment configurations.
• Perform reverse engineering on legacy code to troubleshoot issues.
• Support CI/CD pipelines using Bitrise, Fastlane or GitHub Actions.

Required profile

• Strong experience in Swift and Objective‑C for iOS development.
• Deep knowledge of iOS SDK, SwiftUI, Combine and Clean Architecture.
• Proven ability to work in Agile/Scrum teams and use Jira for task tracking.

Required skills

• Swift
• Objective‑C
• iOS SDK
• SwiftUI
• Combine
• Clean Architecture
• Firebase (Analytics, Crashlytics, Authentication, Firestore)
• Dependency Injection frameworks
• WebView and OAuth authentication flows
• Network optimisation (Retrofit, OkHttp, WebSockets)
• Debugging tools (Logcat, Charles Proxy, Firebase Crashlytics)
• CI/CD automation (Bitrise, Fastlane, GitHub Actions)
• iOS security best practices (ProGuard, obfuscation, secure storage)