Hybrid Mobile App Developer (Android & iOS)

Key Responsibilities

• Design, build, and ship cross-platform apps for Android and iOS using Kotlin Multiplatform and Compose Multiplatform.

• Develop native Android features with Kotlin and Jetpack Compose.

• Integrate with iOS through Swift/SwiftUI interop, expect/actual declarations, and native SDKs where shared code isn't enough.

• Maximize shared code (domain, data, networking, persistence) while keeping a native look and feel on each platform.

• Build offline-first architectures with reliable sync, conflict resolution, and retry handling for payment-critical flows.

• Implement secure networking and storage suitable for financial apps.

• Create responsive, adaptive UIs for phones, tablets, foldables, and different screen densities.

• Build scalable, testable codebases using clean architecture and modular design.

• Profile and optimize startup time, rendering, memory, and battery use on both platforms.

• Work with backend, QA, product, and design teams to deliver releases on the Play Store and App Store.

Required Skills & Experience

Core Technologies

• Strong proficiency in Kotlin, including coroutines, Flow, and sealed classes.

• Hands-on experience with Jetpack Compose: state hoisting, recomposition optimization, side effects, and navigation.

• Proven experience with Kotlin Multiplatform / Compose Multiplatform in production, targeting both Android and iOS.

• Working knowledge of the iOS ecosystem: Xcode, Swift basics, CocoaPods/SPM, provisioning, and signing.

• Strong understanding of MVVM / MVI and unidirectional data flow.

• Dependency injection: Dagger Hilt on Android, and Koin or kotlin-inject in shared KMP modules.

Hybrid / Cross-Platform Experience

• Experience delivering hybrid or cross-platform apps on both Android and iOS.

• Ability to decide what belongs in shared code and what should stay native.

• Experience bridging native platform APIs: camera, biometrics, NFC, push notifications, and deep links.

Technical Expertise

• Networking with Ktor Client (KMP) and Retrofit/OkHttp (Android), including interceptors, auth token refresh, and error handling.

• Serialization with kotlinx.serialization.

• Offline storage with SQLDelight (KMP), Room, or DataStore.

• Lifecycle-aware state management and process-death handling on Android, plus state restoration on iOS.

• Responsive UI with window size classes and adaptive layouts.

Security (Payments Domain)

• Secure storage using Android Keystore and iOS Keychain.

• SSL/certificate pinning, encrypted local data, and secure handling of tokens and sessions.

• Biometric authentication on Android (BiometricPrompt) and iOS (Face ID/Touch ID).

• Awareness of obfuscation (R8/ProGuard), root/jailbreak detection, and PCI-DSS principles.

Development Practices

• Clean code, SOLID principles, and modular Gradle architecture.

• Git workflows: branching, PR reviews, and conventional commits.

• Testing:

• Unit tests with JUnit, kotlin.test, MockK, and Turbine for Flow.

• UI tests with the Compose UI Test framework and XCTest.

• Debugging and profiling with Android Studio Profiler, Xcode Instruments, and LeakCanary.

Nice to Have

• CI/CD for mobile: GitHub Actions or Bitrise, Fastlane, and automated Play Store / TestFlight releases.

• Experience with Flutter or React Native.

• Native iOS development with SwiftUI.

• Material Design 3 and Apple Human Interface Guidelines.

• Crash reporting and analytics with Firebase Crashlytics or Sentry.

• Experience with payment SDKs or gateways, QR payments, or wallet integrations.

• Published apps on the Google Play Store and Apple App Store.