Senior App Developer
Legend is building the next generation of sports media with an app designed to bring fans closer to the action through immersive, real-time experiences. This role is for an App Developer who will help drive the technical direction of the mobile app, collaborate with an external agency during a transition period, and play a crucial role in establishing the in-house engineering team. This is a hands-on position focused on shaping architecture, writing high-quality code, and directly contributing to a product that sports fans will enjoy.
- Build, maintain, and enhance mobile applications using React Native, Expo, EAS, and TypeScript, ensuring smooth performance and platform scalability.
- Work closely with product, design, and backend teams to deliver high-quality, user-centric features.
- Manage OAuth flows and integrations with identity providers like Google and Apple, ensuring secure handling of user data.
- Collaborate with backend engineers to optimize API efficiency, and handle client-side data fetching, caching, and synchronization.
- Define and implement QA processes with automated unit, integration, and end-to-end testing through CI/CD pipelines.
- Manage app releases through TestFlight and App Store Connect, and guide expansion to Android and Google Play distribution.
- 5+ years of software development experience, including 3+ years building mobile apps with React Native.
- Strong expertise with React, Expo, EAS, and TypeScript.
- Deep knowledge of iOS development, Apple Human Interface Guidelines, and app distribution via TestFlight.
- Proven experience with animations, performance optimization, and responsive mobile design.
- Experience integrating third-party identity providers (e.g., Google, Apple) and handling secure authentication flows.
- Proficiency with testing frameworks (Jest, Detox, Testing Library) and CI/CD workflows in agile environments.
- Familiarity with Git, backend API integration, and client-side data management strategies.
- Preferred: Experience with Swift, Android development, Google Play distribution, or high-traffic consumer apps.
- Preferred: Understanding of geolocation, deep linking, and offline data strategies.
- Preferred: Background in sports, media, iGaming and high-traffic consumer apps.
- Super smart colleagues to work alongside and learn from.
- Engaging development opportunities at all levels.
- Tailored flexibility for your work-life balance.
- Annual discretionary bonus to reward your efforts.
- Paid annual leave PLUS a well-deserved break to recharge your batteries during the festive season (offices closed between Christmas and New Year's).
- Long term incentive plan so we can all share in the growth and success of Legend.
- Exciting global Legend events, where we unite in person to ignite our shared passion and unveil the exciting strategies for the year ahead!
Legend is the company behind more than 25 sports and gaming brands, focused on player experience across betting and gaming. It operates with a global team of over 800 people across 10 hubs worldwide, building and growing its portfolio of brands. The company describes its approach as driven by data, creativity and collaboration, summarised in its "Mindset, Vision, Performance" formula. Headquartered in St Helier, Jersey, Legend operates hubs across Europe and North America. In 2026 Genius Sports announced a definitive agreement to acquire the company.
