Senior Mobile Developer (React Native) bei Sage AI Labs

Location: San Francisco, CA (In-Office, 5 Days/Week)
Type: Full-time
Experience Level: Senior (5+ years), Lead/Staff (7+ years)
Start Date: ASAP

About Us

We’re building GOLD, the next-generation super shopping app — a powerful, intuitive AI shopping agent designed to streamline how people discover and buy products online. Our mission is to help people get the best deals on the products they love, through a seamless and delightful shopping experience. Early launches have shown that users love the experience, and the company is entering growth mode to bring this experience into more hands.

We’re an early-stage startup based in San Francisco, led by the founder of GoogleX, Waymo and Udacity. Our team is lean, driven, and highly collaborative. If you're excited about building impactful technology from the ground up — and working shoulder-to-shoulder with an experienced founder — we’d love to meet you.

What You’ll Do

• Lead the design, development, and deployment of our flagship iOS app built with React Native

• Build and maintain high-performance and scalable mobile experiences
  Collaborate closely with design, product, backend engineering and AI research teams to ship shopping features

• Define the architecture and technical roadmap for the iOS app as we scale

• Own critical product features end-to-end, from prototype to production

• Help set and promote mobile engineering best practices, code quality, and performance standards

• Provide mentorship and technical guidance to other engineers as we grow the team
  

What We’re Looking For

• 5-7+ years of professional mobile development experience, with proven expertise shipping consumer-facing apps

• Deep expertise in React Native and strong experience with TypeScript/Node.js
  

• Solid understanding of iOS-specific tooling (Xcode, provisioning, TestFlight) and deployment processes

• Experience integrating with REST APIs

• Strong grasp of mobile performance optimization, offline-first design, and UI/UX best practices

• Comfortable working across the stack with backend engineers when needed

• Bonus: experience with e-commerce or high-traffic consumer apps

• Bonus: past experience leading teams or mentoring other developers

• Bonus: previous experience with Expo Framework
  

Our Tech Stack

• Mobile App: React Native, TypeScript

• Backend: TypeScript (Node.js) and Python

• Infrastructure: Google Cloud Platform

• CI/CD: GitHub Actions, TestFlight, EAS
  

Why Join Us

• Make an impact – Your work will be foundational to the product and user experience

• In-person collaboration – Join a focused, fast-moving team working together daily in San Francisco

• Proven leadership – Work directly with a founder who has built transformative technology companies
  Startup ownership – Influence product and engineering decisions from day one
  Compensation & equity – Well-funded startup with competitive salary, meaningful equity