Software Engineer, Backend

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 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 build and own critical backend services, and collaborate with fellow engineers as we scale to support tens of millions of passionate sports fans.

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 own significant parts of the backend stack and help raise the bar for 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.

- Build scalable, distributed systems capable of handling millions of concurrent users with low latency and high availability.

- Own 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...