Staff Software Engineer, iOS

XOXO AI; Home (KS); On-site; USD 250,000 - 500,000; Full time

Benefits offered by this job

Health, dental, vision benefits

Equity options

On-site in San Francisco

Job summary

XOXO AI in San Francisco is seeking an experienced iOS engineer to own the full mobile surface end-to-end, from architecture to polish. You will build the consumer app using React Native, ensuring a fast, visually striking interface that leverages AI/ML capabilities while maintaining high performance.

The ideal candidate has 3+ years shipping production mobile apps, deep React Native and Swift skills, and a strong sense of craftsmanship.

Qualifications

• 3+ years shipping production mobile apps with elite quality.
• Deep expertise in React Native and Swift, with architecture focus.
• Ability to translate visual design systems into fast, pixel-perfect UI.
• Proven track record optimizing startup/mobile performance and reliability.
• On-site in San Francisco, with high-ownership and craftsmanship.

Responsibilities

• Design and ship the initial React Native iOS app, from prototype to production.
• Translate a visual design system into reusable components with smooth performance.
• Develop new surfaces with AI/ML features integrated into mobile experiences.
• Drive performance across rendering, startup time, memory, and battery.
• Uphold high engineering standards and collaborate across the stack end-to-end.

Skills

React Native

Swift

Mobile performance

Ownership

UI architecture

On-site SF

Tools

Xcode

Job description

About Us

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.

About Us

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.

With a recent breakthrough across infrastructure, architecture, and the model layer, we’re hiring serious builders to develop the interface and application layer that will bring our vision to life.

About The Role

We’re hiring an experienced 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.

Skills & Qualifications

Minimum qualifications:

• 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.

Preferred qualifications — we encourage you to apply if you meet some but not all of these:

• 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.

Logistics

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