Founding Full-Stack iOS Engineer

<h3>About the Role</h3><p style="min-height:1.5em">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.</p><p style="min-height:1.5em">As the <strong>Founding Full-Stack iOS Engineer</strong>, 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.</p><h3>What You'll Do</h3><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Own the companion iOS app end-to-end, from architecture decisions to pixel-perfect UI delivery</p></li><li><p style="min-height:1.5em">Surface emotional-state outputs (energy, mood, focus scores) from the backend inference model in a clear, compelling, and polished consumer experience</p></li><li><p style="min-height:1.5em">Collaborate closely with the founding team — including hardware, neuroscience, and design — to shape the full product experience</p></li><li><p style="min-height:1.5em">Build and maintain full-stack integrations between the iOS app and backend services</p></li><li><p style="min-height:1.5em">Set engineering standards and best practices as the mobile org grows around you</p></li></ul><h3>What We're Looking For</h3><p style="min-height:1.5em"><strong>Required</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Several years of professional experience shipping consumer-grade iOS apps (no fresh graduates)</p></li><li><p style="min-height:1.5em">Strong proficiency in <strong>Swift</strong> and the iOS ecosystem</p></li><li><p style="min-height:1.5em">Full-stack capability — comfortable working across mobile and backend layers</p></li><li><p style="min-height:1.5em">Track record of owning and delivering polished, production-quality mobile products</p></li><li><p style="min-height:1.5em">Self-directed and comfortable working in a fast-moving, early-stage environment</p></li></ul><p style="min-height:1.5em"><strong>Nice to Have</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Experience with health, fitness, or wearable consumer apps</p></li><li><p style="min-height:1.5em">Familiarity with biometric data, Bluetooth/BLE hardware integration, or real-time data streaming</p></li><li><p style="min-height:1.5em">Prior founding or very early-stage startup experience</p></li></ul><h3>Compensation &amp; Benefits</h3><ul style="min-height:1.5em"><li><p style="min-height:1.5em"><strong>Salary:</strong> ~$150,000 USD (or ~£75,000 GBP for London-based candidates)</p></li><li><p style="min-height:1.5em"><strong>Equity:</strong> Up to 1–2% — meaningful founding-level ownership</p></li><li><p style="min-height:1.5em">Early-stage company with Series A/B angel and strategic-partner funding round in progress</p></li><li><p style="min-height:1.5em"><strong>Visa sponsorship:</strong> Not available for new sponsorships; visa transfers are welcome</p></li></ul><h3>Location</h3><p style="min-height:1.5em">Primary office in <strong>London, United Kingdom</strong>. The team is also present in San Francisco. Flexible arrangements considered for the right candidate — on-site or remote.</p><p>Find more <a href="https://www.arbeitnow.com/english-speaking-jobs">English Speaking Jobs in Germany</a> on Arbeitnow</a>