Mobile App Developer
The role involves joining a small, highly collaborative mobile squad responsible for optimising and evolving the sports application. The primary focus is on creating engaging community experiences that encourage user retention, such as social feeds, bet sharing, and chat functionality. Beyond shipping new experiences, the developer will help improve performance, optimise the app, and contribute to the technical direction of the React Native platform.
This is an opportunity to have a significant impact on a product that is central to future growth, helping move users from web-first experiences to an app-first ecosystem. The developer will work closely with Product, Design, and Engineering teammates and play an important role in shaping both the product and how the team builds it.
- Develop, maintain, and optimise the React Native application using Expo, delivering high-quality features that support performance, scalability, and an exceptional user experience.
- Create engaging community experiences, designing and delivering features such as social feeds, bet sharing, chat, and other interactive experiences that encourage users to engage with the app and keep coming back.
- Collaborate across disciplines by partnering closely with Product, Design, and Engineering teams to transform ideas into intuitive, user-centric mobile experiences while contributing to technical discussions and architectural decisions.
- Champion app quality and reliability by monitoring application health using Crashlytics, proactively troubleshooting issues, and continuously improving app performance, stability, and release quality.
- Drive the growth of the mobile platform by helping establish React Native best practices, supporting other engineers as mobile development expands, and contributing to the technical direction of the app across squads.
- 5+ years of software development experience, including 3+ years building mobile apps with React Native (required).
- Strong expertise with React, Expo, EAS, and TypeScript (required).
- Deep knowledge of iOS development, Apple Human Interface Guidelines, and app distribution via TestFlight (required).
- Proven experience with animations, performance optimisation, and responsive mobile design (required).
- Experience integrating third-party identity providers (e.g., Google, Apple) and handling secure authentication flows (required).
- Proficiency with testing frameworks (Jest, Detox, Testing Library) and CI/CD workflows in agile environments (required).
- Familiarity with Git, backend API integration, and client-side data management strategies (required).
- 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 (nice-to-have).
- 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, as offices are closed between Christmas and New Year's.
- Exciting global company events.
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.