Senior ReactJS Engineer

TL;DR

Senior ReactJS Engineer (Social Sportsbook): Develop and maintain responsive web applications for mobile and desktop platforms with an accent on scalable UIs, state management, and real-time features. Focus on optimizing live product performance, implementing RESTful APIs and WebSockets, and collaborating on full software development lifecycle.

Location: Remote with full working-hour alignment to CET ±2 hours; only candidates located within this time zone range will be considered

Company

Fliff is pioneering play-for-fun social sports gaming with a flagship social sportsbook experience including sweepstakes and loyalty rewards.

What you will do

• Develop and maintain responsive web applications using ReactJS across devices.
• Collaborate with backend, DevOps, and designers to implement features and optimize the live product.
• Support the live platform by resolving real-time performance issues.
• Design scalable solutions with responsive UIs using pure CSS/SCSS.
• Mentor juniors and conduct code reviews.
• Leverage Redux for state management and implement RESTful APIs with axios/fetch, optional GraphQL.

Requirements

• 5+ years building modern web apps with strong ReactJS and Hooks expertise
• Advanced TypeScript including utility types, generics, infer.
• Solid Redux, React-Redux, and middleware (Thunk/Saga).
• Strong CSS/SCSS for reusable responsive UIs without external libs.
• WebSockets (native/socket.io) for real-time data.
• RESTful APIs, axios/fetch; React Router for dynamic imports/lazy loading.
• UI tools like Figma, React DevTools, Jest, Cypress.
• Strong communication for cross-functional collaboration

Culture & Benefits

• Competitive compensation.
• Professional development in fast-growing company.
• Supportive, collaborative, knowledge-driven environment.
• Freedom to innovate in sports gaming.
• Inclusive culture valuing diversity, creativity, and rewarding challenges.