Founding Full-Stack iOS Engineer

About the Role This is a founding engineering opportunity at a Y Combinator-backed consumer wearable startup operating at the intersection of biometrics, emotional intelligence, and mobile software. The company is building a wearable device that reads emotional states in real time - think of it as a fitness tracker, but for your EQ - powered by a proprietary computational neuroscience inference model processing over 150 audio and biometric signals. As the Founding Full-Stack iOS Engineer, you will own the companion iOS app end-to-end. This is a high-ownership, high-impact role: you'll be one of the first engineers at the company, expected to grow into a leadership position as the team scales. Prototypes are already on users' wrists - this is a real product with real momentum. What You'll Do • Own the companion iOS app end-to-end, from architecture decisions to pixel-perfect UI delivery • Surface emotional-state outputs (energy, mood, focus scores) from the backend inference model in a clear, compelling, and polished consumer experience • Collaborate closely with the founding team - including hardware, neuroscience, and design - to shape the full product experience • Build and maintain full-stack integrations between the iOS app and backend services • Set engineering standards and best practices as the mobile org grows around you What We're Looking For Required • Several years of professional experience shipping consumer-grade iOS apps (no fresh graduates) • Strong proficiency in Swift and the iOS ecosystem • Full-stack capability - comfortable working across mobile and backend layers • Track record of owning and delivering polished, production-quality mobile products • Self-directed and comfortable working in a fast-moving, early-stage environment Nice to Have • Experience with health, fitness, or wearable consumer apps • Familiarity with biometric data, Bluetooth/BLE hardware integration, or real-time data streaming • Prior founding or very early-stage startup experience Compensation & Benefits • Salary: ~$150,000 USD (or ~ 75,000 GBP for London-based candidates) • Equity: Up to 1-2% - meaningful founding-level ownership • Early-stage company with Series A/B angel and strategic-partner funding round in progress • Visa sponsorship: Not available for new sponsorships; visa transfers are welcome Location Primary office in London, United Kingdom. The team is also present in San Francisco. Flexible arrangements considered for the right candidate - on-site or remote. Originally posted on Himalayas