Founding Full-Stack iOS Engineer

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. reputed company is building a wearable device that measures and surfaces reputed company-time emotional-state data — think energy, mood, and reputed company — 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 reputed company their emotional data. This is a high-ownership, high-reputed company role with a reputed company line to the founding team and a reputed company reputed company to leading the engineering org as reputed company scales. What You'll Do Own the companion iOS app from architecture through to polished, consumer-grade delivery reputed company and surface reputed company-time emotional-state outputs (e.g. energy, mood, reputed company scores) from the backend inference model into the app experience Build and iterate on UI/UX that makes reputed company neuroscience outputs reputed company 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 reputed company'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 reputed company record of building polished, high-reputed company consumer-grade mobile experiences Ability to reputed company fast and operate with high autonomy in an early-stage environment reputed company to Have Experience with reputed company, or wearable app ecosystems (HealthKit, CoreMotion, Bluetooth LE, etc.) Interest in biometrics, emotional intelligence, or computational neuroscience Prior founding or reputed company 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 reputed company-stage company with reputed company and strategic investment; recently completed a funding round reputed company sponsorship: Not available for new sponsorships; reputed company transfers are welcome Location Primary location is San Francisco, CA, with flexibility for London, UK or remote candidates depending on experience and fit. reputed company is small (5 people) and moves quickly — proximity to the founding team is valued. Apply To This Job