Senior React Native Engineer (Fantasy Sports)

Worky; San Francisco (CA); On-site; USD 180,000 - 235,000; Full time

Benefits offered by this job

Medical

Dental

PTO

401k

Job summary

Sleeper is seeking a senior mobile developer to own the mobile app for its fantasy sports platform, built with React Native and TypeScript. You will focus on scalability, reliability, and quality to support millions of users daily.

Join a fast-growing team, collaborating with designers and engineers to deliver new features, improve performance, and maintain a high-quality mobile experience in a dynamic environment.

Qualifications

• 4+ years of mobile application development experience, with React Native as the primary framework.
• Bachelor's degree in Computer Science or equivalent experience.

Responsibilities

• Collaborate with designers to translate user requirements into technical specs for the fantasy sports product.
• Write clean, maintainable code using React Native, TypeScript, and related libraries (React Query, Navigation, Reanimated).
• Troubleshoot performance, socket, data caching issues; develop reusable UI components and a well-structured component hierarchy.
• Integrate front-end components with back-end services via RESTful or GraphQL APIs.
• Stay up-to-date on React Native advances and accessibility guidelines.

Skills

Mobile development

Team collaboration

Problem solving

Software design

Education

Bachelor's degree in Computer Science

Tools

React Native

TypeScript

React Query

React Navigation

Reanimated

Job description

About Sleeper:

Sleeper is a rapidly expanding platform for fantasy sports and games, revolutionizing the way sports fans connect and engage. Though once only an NFL fantasy football company, we have continued to expand our offerings over 10+ years of operation with NBA, LCS, and soccer. In Sleeper Picks, our real-money Daily Fantasy Sports (DFS) game, users predict player performance against projections provided by third-party vendors. We are at the forefront of innovation in the sports gaming industry, backed by some of Silicon Valley's top investors.

Role Overview:

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.

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.

Responsibilities:

• 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.

Who You Are:

• 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 We Offer:

• A salary range of $180,000 to $235,000 USD, based on experience, plus benefits including Medical, Dental, PTO, and 401k.

• A small, impactful team environment where you can truly make a difference.

• Support for professional growth with a company backed by leading investors.