Founding Full-Stack iOS Engineer

Role Summary

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.

Responsibilities

• 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

Requirements

• 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
• 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

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.