Founding Full-Stack iOS Engineer

ABOUT THE ROLE This is a founding iOS engineering role at an early-stage wearable technology startup backed by Y Combinator, building a consumer device that monitors and interprets emotional states in real time. You will own the companion iOS app end-to-end, translating sophisticated AI model outputs into intuitive, polished experiences for users. As one of the first technical hires, you will have real ownership over the primary consumer touchpoint and a direct hand in shaping how the product grows. WHAT YOU'LL DO - Own the companion iOS app from architecture through deployment and ongoing iteration. - Surface emotional-state outputs from the core inference model through clean, intuitive app interfaces. - Build and ship a polished, consumer-grade mobile experience that meets high product standards. WHAT WE'RE LOOKING FOR - At least 2 to 3 years of professional iOS engineering experience; this role is not suitable for fresh graduates. - Strong Swift proficiency and a proven track record shipping polished, consumer-grade iOS applications. - Experience building data-driven apps that present complex model or sensor outputs through clean, accessible interfaces. - Strong computer science fundamentals and the ability to make and own technical decisions autonomously as a founding engineer. - Comfortable working independently across time zones and collaborating on a lean, distributed team. - Full-stack iOS capability, comfortable owning the app layer end-to-end. COMPENSATION & BENEFITS Salary of $150,000 USD (or approximately GBP 75,000 for London-based candidates), plus meaningful early equity of up to 1 to 2%. No new visa sponsorship is available; visa transfers and OPT transitions are acceptable. LOCATION On-site in London, England, UK. The team also has presence in San Francisco; candidates in other locations may be considered on a case-by-case basis.