Fliff
Fliff18mo ago

Senior ReactJS Engineer

SofiaRemoteFull timesenior
OtherFrontend EngineeringEngineer
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Quick Summary

Overview

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,

Technical Tools
OtherFrontend EngineeringEngineer
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.

Who We Are Looking For
If you are passionate about building scalable and engaging web applications, we want you on our team! Fliff is seeking a talented Sr. ReactJS Engineer to join our growing Social Sportsbook team. You’ll be part of a cross-functional group responsible for the full software development life cycle, focusing on delivering top-tier web experiences for both mobile and desktop platforms. The Sportsbook Reliability is a dynamic team that brings together skilled engineers and product managers who collaborate closely to build, release, and support live apps that our users love.


This role requires full working-hour alignment with Central European Time (CET ±2 hours) to enable daily, real-time collaboration with our Sofia-based team. We are only considering candidates located within this time zone range. Applicants outside CET ±2 hours will not be considered.
  • Develop and maintain responsive web applications using ReactJS, ensuring a seamless experience across devices.
  • Collaborate with backend, DevOps, and designers to implement new features and optimize the live product.
  • Support the live platform by identifying and resolving real-time performance issues.
  • Design scalable solutions with attention to responsive UIs using pure CSS/SCSS without relying on external frameworks.
  • Mentor junior engineers and provide code reviews to maintain high standards.
  • Leverage Redux, React-Redux bindings, and middleware (Thunk/Saga) for state management.
  • Implement RESTful APIs using axios and fetch, with optional GraphQL integration via Apollo client.
  • 5+ years of experience building modern web applications, with strong expertise in ReactJS and React Hooks (useState, useEffect, custom hooks).
  • Advanced TypeScript skills, including utility types (Partial, Pick), generics, and infer keyword usage.
  • Solid understanding of Redux mechanics, React-Redux bindings, and internal hooks.
  • Strong CSS/SCSS knowledge, with the ability to build reusable, responsive UIs without external libraries (e.g., Material UI, Tailwind).
  • Knowledge of WebSockets (native and socket.io) to handle real-time data.
  • Experience with RESTful APIs, axios, and fetch, with optional GraphQL and Apollo Client experience.
  • Familiarity with React Router for dynamic imports, lazy loading, and code splitting.
  • Comfortable with UI tools like Figma, along with React DevTools, Chrome debugger, and testing tools such as Jest and Cypress.
  • Adaptability and problem-solving skills to handle real-time challenges and evolving project requirements.
  • Strong communication skills and a collaborative mindset to work effectively with cross-functional teams.
  • Competitive compensation package.
  • Opportunity for professional development in a dynamic, fast-growing company.
  • Supportive, collaborative, and knowledge-driven work environment.
  • Engaging and challenging role with the freedom to innovate and build exciting solutions in the sports gaming industry.

    • Location & Eligibility

    Where is the job
    Worldwide
    Fully remote, anywhere in the world
    Who can apply
    Same as job location
    Listed under
    Worldwide

    Listing Details

    Posted
    October 17, 2024
    First seen
    March 26, 2026
    Last seen
    May 3, 2026

    Posting Health

    Days active
    37
    Repost count
    0
    Trust Level
    39%
    Scored at
    May 3, 2026

    Signal breakdown

    freshnesssource trustcontent trustemployer trust
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    Fliff
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    Fliff, Inc. is a free-to-play social sports gaming platform that allows users to make sports predictions and earn rewards without financial risk.

    Employees
    125
    Founded
    2018
    Domain
    getfliff.com
    Jobs
    View 55 jobs
    View company profile

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    FliffSenior ReactJS Engineer
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