Senior Mobile Engineer, Media Products

The Bullish Group has built an ecosystem focused on developing financial services for the digital assets sector through technology and investment businesses. These include: Bullish Exchange - digital asset trading services that utilize central limit order matching and proprietary market making technology to deliver deep liquidity and tight spreads within a compliant framework. The business is licensed by the Hong Kong Securities and Futures Commission, German Federal Financial Supervisory Authority, and the Gibraltar Financial Services Commission. Since its launch in November 2021, Bullish Exchange has surpassed US$1.3 trillion in total trading volume, with 2H 2024 average daily volume exceeding US$2 billion. Bullish Capital - an investment company which offers strategic capital, industry expertise and an extensive network of resources to support initiatives that connect conventional finance with the revolutionary possibilities of the digital economy. CoinDesk - an award-winning media, events, indices and data business servicing the global crypto economy.

Reports to:

The Opportunity

Are you passionate about building exceptional mobile experiences that connect millions of users to the world of cryptocurrency and digital assets? We're looking for a Senior Mobile Engineer with expertise in React Native and Expo to develop CoinDesk's next-generation mobile application. You'll be working on the CoinDesk mobile app that serves crypto enthusiasts, traders, and industry professionals who need immediate access to market-moving news, price alerts, and comprehensive market analysis. This includes building robust mobile features, developing engaging user experiences, and ensuring optimal performance across iOS and Android platforms. If you love crafting exceptional mobile experiences, enjoy tackling complex technical challenges, and want to make an impact in the rapidly evolving crypto and media space, we'd love to hear from you.

Note: This position is based in NYC and will be required to work from our office located near Union Square three (3) days per week.

What You'll Do:

• Build and maintain the CoinDesk mobile application using React Native and Expo, delivering real-time crypto market data, news, and interactive features to millions of users across iOS and Android.

• Develop highly performant and stable mobile experiences capable of handling real-time market data streams, push notifications, and complex user interactions.

• Collaborate with product teams to implement user-centric features, optimize app performance, and ensure the mobile experience aligns with CoinDesk's brand and user expectations.

• Design and integrate mobile-optimized APIs and work with backend systems to ensure seamless data flow between mobile clients and server infrastructure.

• Implement comprehensive testing strategies including unit, integration, and end-to-end testing to ensure app reliability and reduce production issues.

• Monitor and improve app stability using crash reporting, performance monitoring, and user analytics to proactively identify and resolve issues.

What You Have:

• Hands-on mobile development expertise with React Native for building cross-platform applications.

• Strong knowledge of automated testing practices including experience writing unit, integration, and end-to-end tests using frameworks like Jest, Testing Library, Detox, or Playwright.

• Familiarity with CI/CD pipelines and experience integrating testing and deployment processes into GitHub Actions or similar platforms.

• Experience with debugging and improving app stability using tools like DataDog, Sentry, Firebase Crashlytics, or similar platforms to track crashes and performance issues.

• Experience working with REST APIs and backend systems including the ability to debug endpoints and collaborate effectively with backend teams.

• Strong communication and collaboration skills with the ability to work cross-functionally while proactively contributing to technical discussions.

• Proactive mindset with a demonstrated ability to identify problems early and take initiative in driving projects forward.

Bonus Points For:

• Up-to-date understanding of the React Native and Expo ecosystem including experience with library upgrades and long-term maintenance strategies.

• Experience with observability tooling such as Datadog, LogRocket, or similar platforms for logging, monitoring, and performance tracking.

• Experience writing or maintaining internal documentation with the ability to create clear documentation for both technical and non-technical audiences.

• Exposure to OTA updates and app store submission processes including familiarity with EAS Update, Apple App Store, and Google Play Store processes.

• Mobile accessibility and UI/UX experience with awareness of platform-specific design conventions and accessibility standards.

• Security-minded development experience including familiarity with secure data handling, authentication flows, and mobile security best practices.

Bullish US LLC & CoinDesk Inc. are committed to offering competitive compensation and benefits. The anticipated base salary for this position is $200,000 - $245,000 + discretionary annual target bonus + performance incentives/benefits. Offered salary will be reflective of job related knowledge, skills and commensurate experience.

Bullish is proud to be an equal opportunity employer. We are fast evolving and striving towards being a globally-diverse community. With integrity at our core, our success is driven by a talented team of individuals and the different perspectives they are encouraged to bring to work every day.