Senior Frontend Engineer (Mobile) at Sleeper

Feedinkoo; United States; On-site; USD 180,000 - 235,000; Full time

Benefits offered by this job

Medical

Dental

PTO

401k

Job summary

Sleeper is seeking a highly intelligent Frontend Software Engineer to help build our mobile and web products, impacting millions of users daily.

You will collaborate with designers, write clean React Native and TypeScript code, create reusable UI components, and connect to back-end services via REST or GraphQL.

This role demands strong JavaScript skills, a CS degree or equivalent, and a proactive approach in a fast-paced environment; a competitive salary is offered.

Qualifications

• 5+ years of mobile/web frontend development.
• Degree in Computer Science or equivalent.
• Strong JavaScript and React Native knowledge.

Responsibilities

• Collaborate with designers to translate requirements into technical specs.
• Write clean, maintainable code using React Native, TypeScript, and related libraries.
• Develop reusable UI components with a well-structured hierarchy.
• Implement UI functionality using React state, props, hooks, and lifecycle methods.
• Integrate front-end with back-end services via REST or GraphQL.
• Troubleshoot performance, sockets, data caching and other issues.
• Stay up-to-date on React, mobile development practices, and accessibility guidelines.

Skills

Frontend development

JavaScript

React Native

TypeScript

Education

Bachelor's degree in Computer Science

Tools

React Query

Navigation

Reanimated

Job description

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.

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.