Senior Software Engineer - React / React Native

We're looking for a Senior Software Engineer to join our Sportsbook Core Apps engineering team. You'll be working on foundational engineering, focusing on improving the underlying frameworks, tooling, and performance that enable FanDuel to deliver an exciting and innovative customer experience.

Working with our React Native Sportsbook application, you'll enhance the core React Native platform and shared codebase to improve performance, scalability, reliability, and developer experience. You'll collaborate closely with engineers across the org to ensure the React Native stack integrates cleanly with native layers and enables feature teams to deliver safely and quickly.

We're looking for skilled engineers who are empathetic communicators with a commitment to continuous improvement and engineering excellence. The ideal candidate has significant experience delivering production React Native applications, can propose pragmatic solutions to performance and platform challenges, and enjoys mentoring others and raising quality standards. As a member of this team, you will strengthen the foundations of our mobile platform, enabling FanDuel engineers to deliver features more effectively while maintaining platform quality and best practices.

We are a growth company so there are plenty of opportunities for you to learn & grow with us.

Some of your responsibilities will include:

• Enhancing the core React Native codebase for the Sportsbook app, focusing on performance, scalability, and maintainability
• Profiling and optimising app startup and runtime performance across the React Native stack (rendering, bundle size, memory, JS/native thread work, etc.)
• Building and maintaining shared frameworks, tooling, libraries, and components that support feature teams
• Improving developer experience through better tooling, documentation, templates, CI reliability, and build performance
• Contributing to technical design discussions and leading multi-phase improvements, breaking work into incremental, testable deliveries aligned with team priorities
• Supporting continuous improvement initiatives that raise quality, reduce toil, and improve operational readiness within the domain
• Joining our on-call rota, sharing out of hours support duties as part of our incident response process, Additionally, our Senior Engineers can:
• Contribute meaningfully to technical design discussions and propose pragmatic solutions aligned with our technical vision
• Take ownership of delivering platform improvements end to end, including measurement, rollout, and iteration
• Mentor and support other engineers, raising the bar through thoughtful reviews, coaching, and knowledge-sharing
• Participate in wider engineering community initiatives and help spread best practices

• Significant experience delivering production React Native applications (OR strong React skills with interest in mobile development)
• Strong TypeScript skills and a solid understanding of React patterns, architecture, and maintainable code practices at scale
• Practical experience profiling and improving performance in React Native applications (startup time, rendering, responsiveness, memory, etc.)
• Experience with React Native native modules / bridging; native Android (Kotlin/Java) and/or iOS (Swift) experience is a plus
• Familiarity with mobile development best practices, testing strategies, and CI/CD pipelines
• Experience working in Agile teams and contributing to collaborative technical standards
• A quality-focused mindset with strong problem-solving skills and the ability to evaluate trade-offs in ambiguous situations

At FanDuel, we give fans a new and innovative way to interact with their favorite games, sports and teams. We're dedicated to building a winning team and we pride ourselves on being able to make every moment mean more, especially when it comes to your career. So, what does "winning" look like at FanDuel? It's recognition for your hard-earned results, a culture that brings out your best work-and a roster full of talented coworkers. Make no mistake, we are here to win, but we believe in winning right. That means we'll never compromise when it comes to looking out for our teammates. From creatives professionals to cutting edge technology innovators, FanDuel offers a wide range of career opportunities, best in class benefits, and the tools to explore and grow into your best selves. At FanDuel, our principle of "We Are One Team" runs through all our offices across the globe, and you can expect to be a part of an exciting company with many opportunities to grow and be, FanDuel Group is the premier mobile gaming company in the United States and Canada. FanDuel Group consists of a portfolio of leading brands across mobile wagering including: America's #1 Sportsbook, FanDuel Sportsbook; its leading iGaming platform, FanDuel Casino; the industry's unquestioned leader in horse racing and advance-deposit wagering, FanDuel Racing; and its daily fantasy sports product. In addition, FanDuel Group operates FanDuel TV, its broadly distributed linear cable television network and FanDuel TV+, its leading direct-to-consumer OTT platform. FanDuel Group has a presence across all 50 states, Canada, and Puerto Rico. The company is based in New York with US offices in Los Angeles, Atlanta, and Jersey City, as well as global offices in Canada and Scotland. The company's affiliates have offices worldwide, including in Ireland, Portugal, Romania, and Australia. FanDuel Group is a subsidiary of Flutter Entertainment, the world's largest sports betting and gaming operator with a portfolio of globally recognized brands and traded on the New York Stock Exchange (NYSE: FLUT). Diversity, Equity and Inclusion FanDuel is an equal opportunities employer. Diversity and inclusion in FanDuel means that we respect and value everyone as individuals. We don't tolerate bias, judgement or harassment. Our focus is on developing employees so that they reach their full potential.