React Native Developer

Job Description Job Description Role: Senior Mobile Engineer, React Native
Location: Alameda CA
" Build and maintain consumer mobile features across iOS and Android using React Native, including CGM data
visualization, AI-powered food logging, personalized metabolic insights, and AI health assistant experiences.
" Own your areas of the React Native codebase end to end, from architecture and design through implementation, testing,
and ongoing maintenance.
" Write clean, well-tested, performant React Native code that works reliably across a wide range of iOS and Android
devices and OS versions.
" Identify and resolve performance issues across the React Native layer, including JavaScript thread bottlenecks, render
optimization, and memory management.
" Work with native modules and understand how React Native bridges to iOS and Android platform capabilities, including
integrations with CGM hardware SDKs and Bluetooth data streams.
" Participate in Lingo's ongoing migration from React Native toward native iOS and Android where appropriate, contributing
your perspective on what should migrate and how.
" Conduct code reviews that raise the quality bar across the mobile team, sharing knowledge and holding a high standard
for readability, testability, and maintainability.
" Partner with Product and Design to translate requirements into well-scoped, high-quality engineering solutions and push
back constructively when scope or approach creates unnecessary complexity.
" Contribute to mobile testing practices, including unit, integration, and end-to-end testing across the React Native layer.

Required Qualifications

" Bachelor's degree in computer science, Engineering, or a related technical discipline.
" 5 years of professional software engineering experience, with at least 3 years using React Native as a primary
technology in a production consumer application.
" Strong, demonstrable React Native expertise, including component architecture, state management, navigation,
performance optimization, and the React Native new architecture (JSI, Fabric, TurboModules).
" Working knowledge of iOS and/or Android platform fundamentals, sufficient to understand how React Native interacts with
the native layer, read and interpret native code when debugging, and make informed decisions about native module
usage.
" Experience working with native modules in a React Native application, including consuming existing native modules and
understanding how they bridge to platform capabilities.
" Solid understanding of mobile application architecture patterns, including state management solutions (Redux, Zustand,
or equivalent), navigation libraries, and offline-first design.
" Experience with mobile performance profiling and optimization at the React Native layer, including identifying and
resolving JavaScript thread and render performance issues.
" Experience writing automated tests for React Native applications, including unit and integration tests and familiarity with
end-to-end testing frameworks.

Preferred Qualifications
" Hands-on experience writing native iOS code in Swift or native Android code in Kotlin, beyond reading and debugging into
actively building native modules or platform-specific features.
" Experience in consumer health, digital health, or regulated industries where software quality has direct implications for
end users.
" Familiarity with CGM, biosensor, or IoT data integration in mobile applications, particularly real-time data streams from
wearable hardware.
" Exposure to Bluetooth Low Energy protocols and mobile SDK integration for wearable or connected health devices.
" Exposure to on-device AI or ML capabilities such as Core ML or TensorFlow Lite integrated within a React Native
application.
" Experience with app store release processes for iOS and Android, including CI/CD pipeline integration for mobile builds.
" Prior experience at a high-growth consumer technology company or digital health environment.