Deep expertise in native mobile development — Swift/SwiftUI for iOS and/or Kotlin/Jetpack Compose for Android — or strong experience with cross-platform frameworks (React Native, Flutter) with native bridging capabilities. Proven track record of shipping high-quality, production-grade mobile applications at scale, with full ownership over reliability, performance, and quality. Strong understanding of mobile architecture patterns (MVVM, Clean Architecture, MVI) and the ability to apply them pragmatically. Experience with mobile CI/CD pipelines (Fastlane, Bitrise, GitHub Actions) and end-to-end management of App Store and Google Play release processes. Proficiency in mobile testing frameworks and strategies (XCTest, Espresso, Detox, or equivalent) with a strong bias toward test coverage as a quality gate. Solid understanding of mobile performance optimization — memory management, battery usage, network efficiency, and offline-first design patterns.