Sleeper

Develop and maintain scalable React web applications with reusable UI components, integrate frontend with backend APIs, and ensure high quality and performance. | 5+ years of frontend web development experience with strong JavaScript and React skills, ability to work in fast-paced environments, and a degree or equivalent experience. | About Sleeper: Sleeper is a rapidly expanding platform for fantasy sports and games, revolutionizing the way sports fans connect and engage. With Sleeper Picks, our real-money Daily Fantasy Sports (DFS) game, users predict player performance against statistical 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 Web 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 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 web platform consists primarily of React, typescript, and webpack and shares much of its core with our mobile product. We’re looking for an experienced web developer who can bring their knowledge and skills to help refine our web product; bringing feature, quality, and technology parity to our mobile experience. Responsibilities: • Collaborate with designers to understand user requirements and translate them into technical specifications for the React web application. • Write clean, maintainable, and efficient code using React, JS, and related libraries (Tailwind, React Query, NextJS, etc.). • Develop reusable UI components and implement a well-structured component hierarchy for the React application. • Implement user interface (UI) functionality and logic using React features like state management, hooks, and server-side rendering. • Integrate front-end components with back-end services using APIs (RESTful or GraphQL). • Troubleshoot and debug complex web application issues • Stay up-to-date on the latest advancements in React, web development best practices, Core Web Vitals, and accessibility guidelines. Who You Are: • A degree in Computer Science or equivalent experience • 5+ years of 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 strong a web technologies skillset • 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 $150,000 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. Our Hiring Philosophy Sleeper believes in quality over quantity, and intentionally keeps our team small as a result. In past roles, we found it very hard to make a big impact when companies grow too large in size, which has a detrimental effect on the product and the impact any single individual can have. Our team includes designers, engineers, product experts, and finance & operation focused on one thing — connecting people over sports. We believe in fair and equitable pay. Certain locations in the United States require job postings to include a reasonable estimate of the base salary range and/or a general description of benefits and other compensation applicable to the role. Competitive salary plus benefits including Medical, Dental, PTO, 401k. Please note that The salary range for this role ($150,000 to $235,000 per year salary) takes into account a wide range of factors that are considered in making compensation decisions including, but not limited to, skill sets; experience and training; licensure and certifications; and other business and organizational needs. The policy of Sleeper is to provide equal employment opportunities to all applicants and employees without regard to race, color, creed, religion, sex, sexual orientation, gender identity, marital status, citizenship status, age, national origin, ancestry, disability, veteran status, or any other legally protected status and to affirmatively seek to advance the principles of equal employment opportunity. Sleeper is committed to being an Equal Opportunity Employer and offers opportunities to all job seekers, including job seekers with disabilities. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access the Company’s career webpage as a result of your disability. You may request reasonable accommodations by sending an email to jobs@sleeper.app. Headquartered in Las Vegas, NV, Sleeper is backed by Silicon Valley’s top investors, including Andreessen Horowitz, General Catalyst, and Expa. To learn more, visit us online at: www.sleeper.com

Design and build scalable backend systems for real-time fantasy sports applications, lead backend initiatives, optimize performance, and mentor engineers. | 7+ years backend experience with staff-level leadership, proficiency in backend languages (Go, Python, Node.js, Java), cloud experience, and strong system design skills. | Location: Remote-friendly. Preference for SF Bay Area, Los Angeles, NYC, or Pacific Northwest. About Sleeper Sleeper is on a mission to connect people over sports through games and community. As one of the fastest-growing platforms in the fantasy sports and real-money gaming space, we’re redefining how sports fans engage—whether it’s through season-long leagues, pick’em contests, or real-time interactions with friends. Our team is lean, passionate, and product-driven. We obsess over user experience and believe that building delightful, fast, and reliable products is the best way to grow. Backed by some of the most respected investors in Silicon Valley, including Andreessen Horowitz and General Catalyst, we're building the future of sports engagement. About the Role We’re looking for a Staff Software Engineer - Backend to help us scale the core systems behind our fantasy sports and DFS (Daily Fantasy Sports) offerings. In this role, you’ll drive architectural decisions, build critical backend services, and mentor fellow engineers as we scale to support tens of millions of passionate sports fans. As a senior technical leader, you’ll collaborate cross-functionally to bring innovative features to life—from real-time contest engines and game logic to personalized content and secure, seamless payments. You’ll be empowered to own major parts of the backend stack and help define what "great" looks like in terms of performance, scalability, and reliability at Sleeper. What You’ll Do Design and build core backend systems that power Sleeper's games and real-time user experiences—fantasy contests, Sleeper Picks, user profiles, leaderboards, and more. Architect scalable, distributed systems capable of handling millions of concurrent users with low latency and high availability. Lead backend initiatives from concept to deployment, ensuring clean interfaces, well-documented services, and resilient infrastructure. Optimize system performance and proactively address bottlenecks through monitoring, profiling, and capacity planning. Collaborate cross-functionally with product, design, and frontend teams to deliver features that users love. Mentor engineers, provide thoughtful code reviews, and shape backend engineering best practices and standards. Drive innovation, technical direction, and team culture as a key engineering voice at the leadership level. Who You Are 7+ years of backend software engineering experience, including experience in staff-level or tech lead roles. Proven ability to design and scale distributed systems that serve millions of users in real-time or gaming environments. Strong proficiency in one or more backend languages (e.g., Go, Python, Node.js, Java), and an understanding of trade-offs between them. Deep knowledge of databases (both SQL and NoSQL), caching strategies, and message queues (e.g., Kafka, RabbitMQ, Pub/Sub). Comfortable designing and maintaining RESTful and/or graphql APIs, data models, and internal tooling. Cloud experience (AWS, GCP, or similar), with familiarity with containers (Docker) and orchestration (Kubernetes a plus). Strong product mindset—you care about the why, not just the how, and you build with users in mind. Excellent communication and collaboration skills. You elevate your teammates and enjoy mentoring. Bonus: Passion for sports, gaming, or building multiplayer or real-time systems. Why Join Sleeper? Massive Impact – Your work will touch millions of users and help shape the next generation of sports entertainment. High Ownership – We trust our engineers to make high-leverage decisions and drive meaningful outcomes. Startup Agility – Move fast, ship often, and see your work in the hands of users quickly. Culture-First Team – We’re a team of builders, thinkers, and sports lovers who value humility, collaboration, and having fun along the way. What We Offer Competitive salary ($225,000–$300,000/year not inclusive of stock options and benefits) Equity Comprehensive medical, dental, and vision insurance 401(k) with company matching Generous PTO and flexible remote work policy Opportunities for fast career growth in a high-impact role A small, focused team where your contributions truly matter Our Hiring Philosophy Sleeper believes in quality over quantity, and intentionally keeps our team small as a result. In past roles, we found it very hard to make a big impact when companies grow too large in size, which has a detrimental effect on the product and the impact any single individual can have. Our team includes designers, engineers, product experts, and finance & operation focused on one thing — connecting people over sports. We believe in fair and equitable pay. Certain locations in the United States require job postings to include a reasonable estimate of the base salary range and/or a general description of benefits and other compensation applicable to the role. Competitive salary plus benefits including Medical, Dental, PTO, 401k. Please note that The salary range for this role ($225,000 to $300,000 per year salary) takes into account a wide range of factors that are considered in making compensation decisions including, but not limited to, skill sets; experience and training; licensure and certifications; and other business and organizational needs. The policy of Sleeper is to provide equal employment opportunities to all applicants and employees without regard to race, color, creed, religion, sex, sexual orientation, gender identity, marital status, citizenship status, age, national origin, ancestry, disability, veteran status, or any other legally protected status and to affirmatively seek to advance the principles of equal employment opportunity. Sleeper is committed to being an Equal Opportunity Employer and offers opportunities to all job seekers, including job seekers with disabilities. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access the Company’s career webpage as a result of your disability. You may request reasonable accommodations by sending an email to jobs@sleeper.app. Headquartered in Las Vegas, NV, Sleeper is backed by Silicon Valley’s top investors, including Andreessen Horowitz, General Catalyst, and Expa. To learn more, visit us online at: www.sleeper.com

Build scalable multi-player games and messaging platform features, collaborating with frontend teams to deliver products to users. | 3+ years engineering experience, ability to make practical decisions, thrive in ambiguity, and preferred experience with ErlangVM, Cassandra or ScyllaDB, and distributed systems. | Sleeper is a rapidly growing platform for sports fans with messaging at its core. Our backend consists primarily of Elixir and ScyllaDB. We are looking for experienced engineers who have a passion for building multi-player games or messaging products to help us bring Sleeper to the rest of the world. What you’ll be doing • Building multi-player games, messaging, and/or core platform features • Ensuring your solutions are scalable to millions of users • Work with frontend team to deliver products to end users Who you are • Impressive side project or 3+ years of engineering experience • You make practical decisions and trade-offs • You thrive in ambiguous environments • You are good at anticipating things that can go wrong • When things do go wrong, you act calm and think rationally Preferred skills (not required) • Experience with ErlangVM • Experience with Cassandra or ScyllaDB • Experience managing distributed systems infrastructure Sleeper believes in fair and equitable pay. Certain locations in the United States require job postings to include a reasonable estimate of the base salary range and/or a general description of benefits and other compensation applicable to the role. For this role in those locations, the base salary range for new hires is: Annualized Base Pay Range: 150K - 225K