SOFTWARE ENGINEER, MOBILE

Onyx is building a consumer platform for taking positions on events across sports, prediction markets, crypto, and more. They are hiring a Mobile Engineer to build the mobile trading experience using React Native, Expo, and TypeScript. The role involves owning features, managing releases, and working closely with product and design.

• Build and ship customer-facing mobile features using React Native, Expo, and TypeScript.
• Own features across market discovery, trading, positions, balances, payments, and settlement.
• Build responsive experiences powered by live prices, market updates, and real-time activity.
• Own features from technical design through testing, release, monitoring, and iteration.
• Manage releases across the Apple App Store and Google Play Store.
• Improve application performance, reliability, stability, and overall health.
• Build reusable components and scalable mobile architecture.
• Integrate backend APIs, authentication, payments, analytics, push notifications, and third-party services.
• Partner with product and design to turn complex trading concepts into intuitive mobile experiences.
• Strengthen testing, deployment, CI/CD, and over-the-air update processes.

• Have 3+ years of professional mobile engineering experience.
• Are highly proficient in React Native, Expo, and TypeScript.
• Have shipped and maintained consumer applications across iOS and Android.
• Have managed App Store and Google Play submissions and production releases.
• Understand mobile architecture, performance, state management, and testing.
• Have experience with APIs, real-time data, authentication, and third-party SDKs.
• Can independently own complex features from idea through production.
• Move quickly while maintaining a high bar for quality and customer experience.
• Built mobile products in trading, crypto, payments, gaming, sportsbooks, or consumer fintech.
• Experience with WebSockets, live market data, or transaction-based applications.
• Familiarity with Swift or Kotlin.
• Experience with EAS Build, EAS Submit, Expo Updates, and mobile CI/CD.
• Worked with mobile security, biometrics, passkeys, wallets, or identity verification.
• Helped scale a high-frequency consumer application during rapid growth.

• Fully covered medical, dental, and vision insurance.
• Meaningful equity ownership.
• Commuter benefits.
• A front-row seat to building a new category.