### About the Role This is a founding engineering opportunity at a Y Combinator Spring 2026 consumer wearable startup operating at the intersection of emotional intelligence and computational neuroscience. The company is building a wearable device that measures and surfaces real-time emotional-state data — think energy, mood, and focus — derived from a proprietary inference model processing over 150 audio and biometric signals. Prototypes are already on users' wrists. As the Founding Full-Stack iOS Engineer, you will own the companion iOS app end-to-end — the primary surface through which users experience and act on their emotional data. This is a high-ownership, high-impact role with a direct line to the founding team and a clear path to leading the engineering org as the company scales. ### What You'll Do - Own the companion iOS app from architecture through to polished, consumer-grade delivery - Integrate and surface real-time emotional-state outputs (e.g. energy, mood, focus scores) from the backend inference model into the app experience - Build and iterate on UI/UX that makes complex neuroscience outputs intuitive and actionable for everyday users - Collaborate closely with research and hardware to shape the full product experience - Lay the technical foundations and engineering culture as an early founding hire ### What We're Looking For Required - Strong, proven experience shipping consumer iOS apps (Swift) — a few years minimum; not a role for recent graduates - Full-stack capability: comfortable owning both the mobile layer and relevant backend/API integration - Track record of building polished, high-quality consumer-grade mobile experiences - Ability to move fast and operate with high autonomy in an early-stage environment Nice to Have - Experience with health, fitness, or wearable app ecosystems (HealthKit, CoreMotion, Bluetooth LE, etc.) - Interest in biometrics, emotional intelligence, or computational neuroscience - Prior founding or very early-stage startup experience ### Compensation & Benefits - Salary: ~$150,000 USD (San Francisco) / ~£75,000 GBP (London) - Equity: Up to 1–2% — meaningful founding-level ownership - Seed-stage company with angel and strategic investment; recently completed a funding round - Visa sponsorship: Not available for new sponsorships; visa transfers are welcome ### Location Primary location is San Francisco, CA, with flexibility for London, UK or remote candidates depending on experience and fit. The team is small (5 people) and moves quickly — proximity to the founding team is valued.