Software Engineer, iOS

We’re hiring a seasoned iOS engineer to build XOXO’s consumer app with a groundbreaking interface for intelligence. This role is for a truly strong engineer who can own the full mobile surface area end-to-end: architecture, performance, polish, and a highly visual design system that feels intentional in every interaction.

You don’t need a specific background-what matters is your drive: you’re relentlessly high-ownership, you move fast without cutting corners, and you want to build a mobile product that sets a new bar for craft and performance.

What You’ll Do

• Design and ship the first versions of our React Native app, taking it from prototype to production.
• Translate a highly visual design system into reusable components, motion, and interaction patterns with fluid performance.
• Build new product surfaces that incorporate modern AI/ML capabilities in ways that feel natural on mobile.
• Drive performance work across the app: rendering, startup, memory, battery, networking, and perceived speed.
• Set the bar for mobile engineering quality (testing, instrumentation, release discipline) and partner closely across the stack to ship end-to-end.

Software Engineering, iOS, iOS, Mobile Devices, React Native, Prototyping, Artificial Intelligence (AI), Product Development, Startup, Memory Hardware, * 3+ years shipping production mobile apps with a consistently elite quality bar.

• Deep expertise in React Native and Swift, with strong instincts for architecture and long-term maintainability.
• Demonstrated ability to turn a highly visual design system into a fast, pixel-perfect product UI (components, interaction patterns, accessibility).
• Proven track record making mobile apps feel instant under real-world constraints (startup time, rendering, memory, battery, networking) and knowing where to look when things slow down.
• High-ownership builder who moves quickly without sacrificing code quality, reliability, or craft.
• Excited to work in-office in San Francisco 5 days a week., * Experience at an early-stage startup (company outcome doesn’t matter).
• Experience shipping in high-velocity consumer categories with rapid growth (consumer social, gaming, other consumer apps).
• Comfort bridging into native iOS/Android when React Native needs it.
• Experience integrating ML/AI-powered functionality into mobile product experiences.
• Advanced mobile media/graphics experience (3D, real-time rendering, audio, video, streaming).

A link to shipped apps, code samples, or technical writing is strongly encouraged.

• Compensation: $250k-$500k expected salary with 1% to 5% equity depending on background.
• Benefits: Top tier health, dental, vision benefits, and many other perks.

XOXO is a research lab building the interface of intelligence for everyday life. We’re a stealth team of hardcore engineers, designers, and researchers discovering solutions to novel problems impacting life outside work.