React Native Developer — United States — LinkedIn — 4490364501

About The Company

Han IT Staffing connects experienced technology professionals with opportunities to build useful, high-quality products. We are seeking a Senior Mobile Engineer, React Native, for a consumer health technology opportunity focused on helping people better understand and manage their health. The product experience brings together continuous glucose monitoring (CGM) data, food logging, personalized metabolic insights, and AI-powered health support. This role is based in Alameda, California, and offers the opportunity to contribute to mobile experiences with meaningful impact for end users.

About The Role

As a Senior Mobile Engineer, you will build, improve, and maintain consumer mobile features for iOS and Android using React Native. You will take ownership of work from technical planning and architecture through development, testing, release, and ongoing maintenance. You will also help guide an evolving mobile architecture, including the thoughtful migration of selected capabilities from React Native to native iOS or Android when appropriate. Success in this role requires strong mobile engineering fundamentals, sound judgment, and the ability to work closely with Product, Design, and engineering colleagues.

Qualifications

Required qualifications: A bachelor’s degree in computer science, engineering, or a related technical discipline, along with at least five years of professional software engineering experience, is required. Candidates should have three or more years of production experience using React Native as a primary technology in a consumer application. You should bring strong knowledge of React Native architecture, components, state management, navigation, performance optimization, and its new architecture, including JSI, Fabric, and TurboModules.

You should understand iOS and/or Android fundamentals well enough to troubleshoot the interaction between React Native and native platform code, interpret native code when debugging, and make informed decisions about native modules. Experience consuming native modules, applying mobile architecture patterns, and designing offline-first experiences is important. We also seek experience profiling and resolving JavaScript thread, rendering, and memory-related performance issues, as well as writing unit and integration tests and working with end-to-end testing frameworks.

Preferred qualifications: Hands-on Swift or Kotlin development, particularly building native modules or platform-specific features, is a plus. Experience in consumer health, digital health, or another quality-sensitive industry is valuable. Familiarity with CGM or biosensor integrations, Bluetooth Low Energy, wearable data streams, or connected-device SDKs is beneficial. Exposure to on-device machine learning technologies such as Core ML or TensorFlow Lite, mobile CI/CD and app store releases, or a high-growth consumer technology environment is also welcome.

Responsibilities

Develop reliable, accessible, and performant mobile experiences across a broad range of iOS and Android devices and operating system versions. Build features for CGM data visualization, AI-assisted food logging, personalized metabolic insights, and health assistant experiences. Own assigned areas of the codebase, making implementation and maintenance decisions with long-term quality in mind.

Investigate and resolve performance bottlenecks, including JavaScript thread contention, unnecessary rendering, and memory usage. Work with native modules and platform capabilities, including integrations with hardware SDKs and Bluetooth data streams. Contribute to decisions about which capabilities should remain in React Native and which may benefit from native implementation. Review code, share expertise, and promote readable, testable, maintainable solutions. Partner with Product and Design to clarify requirements, define practical scope, and deliver polished features. Strengthen mobile testing practices through unit, integration, and end-to-end coverage.

Benefits

This role offers the opportunity to shape a consumer health product and work on technically challenging mobile experiences spanning React Native, native platforms, connected devices, and emerging AI capabilities. You will have meaningful ownership, collaborate across disciplines, and help influence mobile architecture and engineering quality. Specific compensation, benefits, and employment arrangements can be discussed during the hiring process.

Equal Opportunity

Han IT Staffing is committed to fair and inclusive hiring. Applicants will be considered without discrimination based on legally protected characteristics. We welcome candidates with varied backgrounds and experiences who can contribute to a respectful, collaborative workplace.