Senior React Native / Expo Engineer

What You'll Do

• Architect the Mobile Clinical Experience: Build dynamic, high-performance mobile tools for patients and providers. Architect deep integrations with Apple HealthKit and Google Health Connect to ingest and visualize real-time patient data. Build highly responsive, secure messaging systems connecting patients to care teams.
• Leverage the Expo Ecosystem: Utilize Expo for cross-platform experiences, manage EAS builds, configure custom native modules via Config Plugins, and push OTA updates for rapid iteration.
• Design for the Edge: Architect robust offline-first data synchronization and aggressive local caching to handle spotty connections.
• Champion the Mobile UX: Obsess over premium native feel, frame rates, navigation transitions, keyboard avoidance, and accessibility for diverse patients.
• Build Agentic Workflows: Integrate frontier agentic models into mobile interfaces to automate clinical operations and patient support. Use AI tools to accelerate development.
• Raise the Engineering Bar: Own mobile architectural decisions, establish code reuse patterns between web and mobile, perform rigorous code reviews and mobile testing.

Who You Are (Requirements)

• 5-7+ years of frontend engineering experience with deep focus on React Native and Expo. Built, shipped, and maintained complex, data-heavy mobile applications in production.
• Expo and Mobile Infrastructure expert: Manage EAS builds, integrate native modules (HealthKit/Health Connect) without ejecting, navigate App Store and Play Store guidelines.
• Master mobile state and performance: Understand React render cycle on mobile, prevent UI thread blocking, optimize list rendering for large datasets, orchestrate complex async data fetching.
• Full lifecycle owner: Manage CI/CD, monitor crash rates (e.g. Sentry), own app reliability in production.
• AI-altered workflows: Use frontier agentic tools (e.g. Codex, Claude) to build faster; audit and verify AI output.
• Collaborative builder with low ego, high standards, excellent communication. Thrive in regulated healthcare environments (compliance, patient safety).
• Excited to work 5 days/week onsite in San Francisco office.

For Staff leveling: Track record of setting technical direction across teams, navigating ambiguity, and leveling up engineers.

Nice-to-Haves

• Experience with native iOS (Swift/Objective-C) or Android (Kotlin/Java).
• Strong product sense for mobile healthcare domain.

Compensation

• Senior: $230,000 - $280,000
• Staff: $280,000 - $330,000