Mobile App Engineer (iOS)

We're looking for a Mobile App Engineer (iOS) to join Fullstack. Fullstack Trade is building the only unified front-end trading app for retail crypto – perps, cross-chain spot, and prediction markets under one portfolio margin balance. No bridging, no fragmentation. Founded by Flood, creator of Insilico Terminal ($900B CEX volume, 90% market share), and Robin, operated a leading CEX and on-chain HFT firm. Launching Jan/Feb 2027. You will - Build Fullstack's first mobile trading app from zero: the full trading experience, not a "pocket" version. - Work with live market data, complex order types, and WebSocket streams with reconnection logic. - Design gesture-driven UI and fast interactive charts that fit a professional terminal on a small screen. - Integrate native wallets, biometric auth, transaction signing, and on-device key storage. - Own the full App Store release cycle and CI/CD. - Lay down the mobile architecture future engineers will build on. Requirements - 3+ years of iOS experience in Swift. - Shipped a mobile app from zero to one, through App Store review to production. - Real-time data and WebSockets experience. - Strong UI/UX sensibility: wireframing, gesture-driven interfaces. - High ownership: ready to lead mobile from scratch. - You actively trade crypto or perps, or build trading side projects. - On-site 5 days/week in SoHo, NYC. Stack - Swift, iOS, WebSockets, REST APIs, CI/CD, App Store. Nice to have - Fintech, trading, or real-time data mobile apps. - Crypto-native app experience (wallets, exchanges). - VC-backed startup experience. - Public GitHub or App Store portfolio. We offer - Up to $300k/year salary + equity. - Ownership of mobile from the first line of code. - Small, fully on-site engineering team in SoHo, direct work with the founders.