Senior Mobile Engineer (React Native)

Build the Future of Global Markets At Arcus, we're democratizing access to financial opportunity. The team behind Arcus previously built dYdX, one of the world's largest decentralized exchanges, helping power over $1.5 trillion in trading volume across more than nine years of experience building crypto trading infrastructure. Now we're applying that expertise to an even bigger opportunity: bringing the world's financial markets on-chain. Today, access to markets is still limited by geography, market hours, and legacy financial infrastructure. We believe anyone, anywhere should be able to trade the assets they care about, whenever they want. Built in partnership with Robinhood Chain and backed by a direct investment from Robinhood Crypto, Arcus is creating a unified, self-custodied trading platform where crypto, stock tokens, commodities, and perpetual futures can all be traded seamlessly from a single account, 24/7. Our vision is simple: to make the world's markets open, always-on, and universally accessible. Join us in shaping the next generation of global financial markets. About Arcus Our team has previous experience at Google, Meta, Citadel, DRW, IMC Trading, Stripe and other top companies We're a world-class team with top backers and advisors, including Andreessen Horowitz, Polychain Capital, Brian Armstrong, Fred Ehrsam, Naval Ravikant, Elad Gil and more → Learn more about working at Arcus RESPONSIBILITIES: Build and enhance the Arcus mobile application using React Native Own end-to-end mobile features from architecture and implementation through testing, release, and ongoing maintenance Collaborate closely with product managers, designers, and backend engineers to deliver intuitive and performant mobile experiences Help define the technical direction and architecture of our mobile platform Improve application performance, reliability, observability, and developer experience Work with technologies that directly interface with blockchain networks, wallets, and decentralized protocols Partner with cross-functional teams to deliver best-in-class trading experiences on mobile REQUIREMENTS: You have demonstrated technical excellence through previous work and shipped high-quality mobile applications at scale Strong experience building and maintaining production React Native applications Proficiency in JavaScript and TypeScript Deep understanding of mobile application architecture, state management, networking, performance optimization, and testing Experience publishing and supporting applications on both iOS and Android platforms Strong product sense and attention to user experience details You are a fast learner who can quickly master new technologies and complex systems 5+ years of software engineering experience, including significant experience building mobile applications Experience collaborating with designers, product managers, and backend engineers in fast-paced environments NICE TO HAVES: Experience building financial, trading, fintech, or security-sensitive applications Experience with native iOS (Swift) and/or Android (Kotlin) development Experience with React Query, Redux, Zustand, or similar state management solutions Experience building highly performant real-time applications Experience working with crypto wallets, blockchain technologies, or DeFi products Familiarity with CI/CD pipelines, automated testing, and mobile release processes Experience mentoring engineers and influencing technical direction CS degree or equivalent practical experience Salary range for this role is $210K to $270K (NY). Compensation subject to experience and location. Published salary bands pursuant to transparency laws, and do not include possible variable compensation such as annual merit increases, bonus eligibility, commission, or equity incentive.