Senior Mobile Developer (React Native)

Sage Labs
San FranciscoPosted 24 February 2026

Job Description

Location: San Francisco, CA (In-Office, 4-5 Days/Week) Type: Full-time Experience Level: Senior (5+ years), Lead/Staff (7+ years) Start Date: ASAPAbout UsWe’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 DoLead the design, development, and deployment of our flagship iOS app built with React NativeBuild and maintain high-performance and scalable mobile experiencesCollaborate closely with design, product, backend engineering and AI research teams to ship shopping featuresDefine the architecture and technical roadmap for the iOS app as we scaleOwn critical product features end-to-end, from prototype to productionHelp set and promote mobile engineering best practices, code quality, and performance standardsProvide mentorship and technical guidance to other engineers as we grow the teamWhat We’re Looking For5-7+ years of professional mobile development experience, with proven expertise shipping consumer-facing appsDeep expertise in React Native and strong experience with TypeScript/Node.jsSolid understanding of iOS-specific tooling (Xcode, provisioning, TestFlight) and deployment processesExperience integrating with REST APIsStrong grasp of mobile performance optimization, offline-first design, and UI/UX best practicesComfortable working across the stack with backend engineers when neededBonus: experience with e-commerce or high-traffic consumer appsBonus: past experience leading teams or mentoring other developersBonus: previous experience with Expo FrameworkOur Tech StackMobile App: React Native, TypeScriptBackend: TypeScript (Node.js) and PythonInfrastructure: Google Cloud PlatformCI/CD: GitHub Actions, TestFlight, EASWhy Join UsMake an impact – Your work will be foundational to the product and user experienceIn-person collaboration – Join a focused, fast-moving team working together daily in San FranciscoProven leadership – Work directly with a founder who has built transformative technology companiesStartup ownership – Influence product and engineering decisions from day oneCompensation & equity – Well-funded startup with competitive salary, meaningful equity