Senior React Native Engineer

Fliff unpacks sports gaming into social, free-to-play games for all types of sports fans. We've built a social sports gaming experience that allows users to compete for leaderboard positioning, to achieve badges and build their status within the game.

We are pioneering play-for-fun sports gaming, with our flagship social sportsbook experience that includes sweepstakes promotions and loyalty rewards. We provide sports fans with fun, engaging, and free-to-play alternatives to real money gaming.

We’re seeking a Senior React Native Engineer to help build and scale mobile experiences for our Fantasy platform. You’ll join the Fantasy team — a cross-functional group of engineers and product managers focused on delivering high-performing, user-friendly applications across mobile and desktop.

You should have a deep understanding of modern React patterns, strong TypeScript expertise, and the ability to ship high-quality code in a fast-paced, collaborative environment. Domain experience in sports betting or real-time data platforms is a strong plus.

• Design, develop, and maintain responsive, performant mobile applications using ReactJS and TypeScript.
• Implement scalable, reusable UI components with CSS/SCSS.
• Build seamless experiences across mobile and desktop devices, iOS and Android.
• Collaborate with engineers, designers, product managers, and QA to deliver high-impact features.
• Integrate REST APIs and WebSocket services into the frontend.
• Optimize for performance, maintainability, and reliability.
• Review code, share feedback, and mentor junior engineers.
• Debug and troubleshoot frontend issues using modern developer tools.

• 5+ years of experience in frontend development, with a focus on React Native.
• Strong proficiency with JavaScript (ES6+) and TypeScript 5.0+, including utility types, generics, and advanced type safety.
• Deep understanding of React fundamentals, React 16.0 or higher.
• Solid experience integrating REST APIs with tools like fetch and axios.
• Experience and understanding of GraphQL and Apollo Client.
• Working knowledge of WebSockets (native or Socket.IO ).
• Proficiency in debugging with Reactive Tools from XCode + Profiler and Android Studio + LogCat.
• Testing experience with Jest and React Testing Library.
• Integration with Sentry or other crash analytics tools
• Heavy usage of analytic tools (DataDog, MixPanel, Google Analytics, etc)
• Knowledge of ESLint, and formatting tools like Prettier.
• Experience of UI design tools like Figma, Sketch, or Zeplin.
• Understanding and knowledge of Native Package Managers (CocoaPods for iOS and Gradle for Android).
• Strong communication skills and a proactive, ownership-driven mindset.
• Interest and experience in the sports betting or fantasy sports industry.

• Experience using Storybook for documenting components.
• Exposure to Detox for end-to-end testing.
• Knowledge of Reanimated Library.
• Experience with chat integration.

• The annual salary for this role ranges from $180,000 to $200,000 depending on experience and background.
• Unlimited/ Flexible Time Off: Flexible vacation policy.
• Health benefits with 100% paid premiums* for medical, dental, and vision plans for employees and dependents, plus on-demand healthcare concierge.
• Pre-tax savings plans for healthcare, with up to a $500 annual employer contribution to the HSA (if enrolled in the HSA medical plan).
• Employee-sponsored 401(k) to help reach your financial goals.
• Fully remote work environment.
• Generous parental leave.
• Professional development opportunities in a dynamic, global setting.

• Work Remotely.
• $500 work-from-home stipend + Equipment & Accessories.
• Opportunity for professional development in a dynamic, global setting.
• A supportive, collaborative, and knowledge-driven workplace.
• An engaging and challenging role with the freedom to innovate and develop effective solutions.

#LI-Remote

We are a multinational company with our headquarters based in Philadelphia, and offices in New York, Austin, and Sofia, Bulgaria. Wherever we are in the world, we pride ourselves on being a close-knit, focused team that is welcoming and friendly, and the work that we do is always interesting and rewarding. Wherever we are in the world, we pride ourselves on being a close-knit, focused team that is:

Welcoming and Friendly

We want to reflect the diversity of the cities we serve. By creating an inclusive culture where everyone can thrive, we’ll make Fliff better for employees and customers alike.

Lively and Creative

We respect and value each other’s ideas, experience and expertise. There is no such thing as a bad idea; only ideas that are executed and ideas that are discarded after consideration.

Stimulating and Rewarding

We know bright minds love a challenge, and we understand your desire to see your hard work pay off. We’ll make sure your daily tasks align with your career ambitions as we grow together.