Senior React Native / Expo Engineer

You have operated high-stakes mobile systems.

You have 5-7+ years of frontend engineering experience, with deep, specialized focus on React Native and Expo. You've built, shipped, and maintained complex, data-heavy mobile applications in production.

You are an Expo and Mobile Infrastructure expert.

You understand the modern Expo ecosystem deeply. You know how to manage EAS builds, integrate complex native modules (like HealthKit/Health Connect) without ejecting, and navigate the strict review guidelines of the iOS App Store and Google Play Store.

You master mobile state and performance.

You understand the React render cycle on mobile. You know how to prevent UI thread blocking, optimize list rendering for massive messaging datasets, and orchestrate complex asynchronous data fetching securely.

At Mochi, our engineering team operates with exceptional leverage. We believe in high talent density, where a focused, elite team powers a profitable, nine-figure ARR healthcare platform serving hundreds of thousands of patients. We are looking for a Senior React Native Engineer to own the mobile applications that serve as the primary daily touchpoint for our patients and providers.

Mochi has already helped patients lose over 5 million pounds through metabolic care, and we are now rapidly expanding into the frontiers of preventative healthcare—including hormone optimization (HRT/TRT), longevity medicine, and cutting-edge peptide therapies. The mobile experiences you architect will directly dictate how this next wave of patients tracks sensitive biometrics, communicates securely with their care teams, and manages complex medication protocols.

Because of our high scale-to-team ratio, we do not operate in isolated technical silos. You will act as our mobile product specialist, owning the application end-to-end: from architecting offline-first data synchronization and deep native health integrations, to leveraging Expo to deliver a modern, unified cross-platform experience. If you are drawn to mobile product problems where the domain complexity is real, the autonomy is absolute, and the impact on patient outcomes is tangible, this is the role.

Architect the Mobile Clinical Experience:

You will build the dynamic, high-performance mobile tools our patients and providers rely on. You will architect deep integrations with Apple HealthKit and Google Health Connect to seamlessly ingest and visualize real-time patient data, and build highly responsive, secure messaging systems that connect patients directly to their care teams without friction.