Senior iOS Engineer

Recruiting From Scratch•San Francisco, CA

1d•Onsite

About The Position

As a Mobile Engineer, you will own the quality and development of the company’s iOS experience. You will collaborate with product, design, clinical, and engineering teammates to build fast, intuitive experiences that help members understand their health and take action. This hands-on role includes shaping the app’s architecture, building core features, and owning the experience from development through App Store release. You will work across Swift, SwiftUI, UIKit, React Native, Expo, and TypeScript, with hands-on expertise in both native iOS and React Native development. You will shape mobile architecture, build native integrations, and select the right approach for each experience based on performance, product quality, and development speed. The role is in person in San Francisco, where you will work closely with teammates in a small team and have substantial ownership over what is built and how it is built. The company is developing an all-in-one health platform encompassing lab testing, data aggregation and digital twin, an AI doctor, and peptides.

Requirements

A strong record of shipping and maintaining consumer iOS applications, with clear ownership of the work and its impact on users.
Deep experience with Swift, including native app architecture, concurrency, memory management, production debugging, and performance optimization.
Deep experience with React Native, Expo, and TypeScript, including app architecture, state management, production debugging, and performance optimization.
Strong experience with SwiftUI, UIKit, Apple’s frameworks, and building native modules that connect Swift with React Native.
Strong understanding of app architecture, state management, networking, testing, and App Store release processes.
Excellent product judgment and attention to interaction details, with the ability to balance quality and delivery speed.
Demonstrated ability to work independently in a startup or small engineering team.

Nice To Haves

Interest in healthcare, wellness, or longevity.

Responsibilities

Design and build mobile experiences in Swift and React Native for health results, biomarker data, chat, and other core member journeys.
Collaborate with product, design, and clinical teams to make complex health information clear and useful.
Own mobile architecture, reusable components, and integration between Swift and React Native, including native capabilities such as HealthKit, authentication, notifications, and media access.
Improve app performance, navigation, accessibility, and reliability across devices and network conditions.
Own testing, observability, release tooling, and App Store delivery, with careful handling of sensitive health information.
Work with web and backend engineers on shared data contracts, reusable logic, and development patterns that help the team ship across platforms.