Senior Frontend Engineer (Mobile)

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

We are searching for a highly intelligent and innovative Frontend Software Engineer to join our team. At Sleeper, we believe in the power of smart, creative individuals to drive change and build incredible things, regardless of their background in specific technologies. You will play a crucial role in developing our mobile and web products to ensure scalability, reliability, and quality, impacting millions of dedicated users every day.

Sleeper is a rapidly growing platform for sports fans with social at its core. 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 developer who can bring their knowledge and skills to help refine our product; bringing new features, improved quality, and lightning fast performance to our millions of users.

Responsibilities

• Collaborate with designers to understand user requirements and translate them into technical specifications for our products.
• Write clean, maintainable, and efficient code using React Native, TypeScript, and related libraries (React Query, Navigation, Reanimated, etc).
• Develop reusable UI components and implement a well-structured component hierarchy for the application.
• Implement user interface (UI) functionality and logic using React features like state management, props, hooks, and lifecycle methods.
• Integrate front‑end components with back‑end services using APIs (RESTful or GraphQL).
• Troubleshoot and debug complex performance, socket, data caching and other issues.
• Stay up-to-date on the latest advancements in React, mobile development best practices, and accessibility guidelines.

Who You Are

• A degree in Computer Science or equivalent experience.
• 5+ years of mobile / web development with an emphasis on frontend.
• Desire to take on and own a large scale product with freedom to design and develop a best‑in‑class product.
• Proven ability to develop and implement algorithms or systems in a professional setting, with strong coding skills in Javascript and knowledge of best practices.
• Highly proactive, with a track record of building processes from scratch and a willingness to challenge traditional risk management paradigms.
• Comfortable in fast‑paced, ambiguous environments, thriving on innovation and the challenge of creating something new.

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.
• The opportunity to be at the forefront of transforming the sports betting and DFS landscape.
• Support for professional growth with a company backed by leading investors.