Senior React Native Engineer

Who you are

• We're hiring at the senior level, but will seriously consider strong mid-level engineers — we care more about what you've shipped and how deeply you understand it than about years on a resume
• An active fantasy sports player: you're in leagues each season and have opinions about how the product should work
• 4+ years of mobile application development experience, with React Native as your primary framework
• Desire to take on and own a large scale product with freedom to design and develop a best in class experience
• Proven ability to develop and implement algorithms or systems in a professional setting, with strong coding skills and knowledge of best practices
• Comfortable in fast-paced and ambiguous environments, working inside a large, established codebase
• Hold a degree in Computer Science or have equivalent experience

What the job involves

• You'll be working on our fantasy sports product — season-long leagues, drafts, matchups, live scoring, and the social layer that connects them. It's the core of Sleeper, with traffic that peaks hard on game days and a season calendar that doesn't move. You will play a crucial role in developing our mobile application to ensure scalability, reliability, and quality, impacting millions of dedicated users every day
• Our mobile platform is built on React Native, and has been modernized with TypeScript and many of the leading packages like react-query, react-navigation, and reanimated. We’re looking for an experienced mobile developer who can bring their knowledge and skills to help refine our app; bringing new features, improved quality, and lightning fast performance to our millions of users
• Collaborate with designers to understand user requirements and translate them into technical specifications for our fantasy sports product
• Write clean, maintainable, and efficient code using React Native, TypeScript, and related libraries (React Query, Navigation, Reanimated, etc)
• Troubleshoot and debug complex performance, socket, data caching and other issues
• Develop reusable UI components and implement a well-structured component hierarchy for the application
• Integrate front-end components with back-end services using APIs (RESTful or GraphQL)
• Stay up-to-date on the latest advancements in React Native, mobile development best practices, and accessibility guidelines

Benefits

• 401k and health insurance
• Unlimited Vacations
• Regular virtual game-time with the team with company-sponsored snacks
• Company-sponsored fantasy leagues with real prizes
• Team outing every quarter and company retreat once a year