Manual
Senior Mobile Engineer - Do Health
OnsiteSeniorLondon, England, the United KingdomHealthTechB2C
Our Take
Build a preventative health app using React Native for a health-tech startup.
What you’ll do
- Own major mobile features end-to-end
- Collaborate with product and design
- Make product and engineering decisions
- Drive app performance improvements
- Architect scalable patterns
- Champion high engineering standards
- Ship high-quality features independently
What they’re looking for
- 5+ years frontend engineering experience
- Deeply experienced with TypeScript
- Deeply experienced with React Native
- Deeply experienced with Expo
- Product-minded with focus on UX
- Experience in fast-moving startups
Skills & Focus Areas
- TypeScript
- React Native
- Expo
- AI tools
- state management
- API integration
- offline-first
- testing
As posted by Manual
Do Health is a mobile-first, preventative health product built by a small, autonomous team within Voy. We operate like an independent startup — modern stack, high trust, fast decision-making — with the backing and resources of an established company. Co-founded by Dr Rangan Chatterjee, our mission is simple but ambitious: shift healthcare from reactive treatment to proactive prevention.
You’ll join the core product engineering team responsible for building and scaling our Expo / React Native app. This is not a ticket-taking role. You’ll own major mobile features end-to-end, influence architecture and product direction, and help shape how thousands (and eventually millions) of people understand and improve their health over time. If you care about craft, autonomy, and building something meaningful — this is a rare chance to do all three.
What you’ll do
Own major mobile features end-to-end in our Expo / React Native app, from concept to production.
Collaborate closely with product and design to shape UX, technical architecture and delivery strategy.
Make product and engineering decisions, not just implement predefined specs.
Drive improvements in app performance, reliability and maintainability as we scale.
Architect scalable patterns for state management, API integration and offline-first experiences.
Champion high engineering standards: testing, observability, code quality and thoughtful reviews.
Use AI tools responsibly to accelerate development while maintaining quality and correctness.
Ship high-quality features independently, with minimal oversight, in a fast-moving environment.
Who you are
5+ years of frontend engineering experience with strong software fundamentals.
Deeply experienced with TypeScript, React Native and Expo.
Takes full ownership of projects and sees them through to measurable impact.
Product-minded: cares about UX, user outcomes and craft — not just code.
Comfortable operating in ambiguity and making sound technical judgement calls.
Pragmatic and execution-focused — you ship, iterate and improve.
Experienced in fast-moving consumer startups, scaleups or design-focused teams.
Confident using AI tools thoughtfully — accelerating output without compromising engineering quality.