Front-End Developer - Realtime Sports Graphics & Web Rendering

Location: Manchester / London, with hybrid working  
Role Type: Full-time  
Reports to: Director of Technology   About Us  Rezzil creates performance products for sport across VR, mobile, console and gaming, serving B2B, B2C and elite performance markets. Our products support training, analysis, fan engagement and immersive sports experiences across the sports industry.  
 
Exar.live is our live game data ingest and transport platform, powering real-time analysis tools for VR, broadcast and performance environments. As we continue to grow, we are also expanding into new areas, including computer vision and AI-driven solutions.  
  
We are Manchester based, with an office in London, and we will be opening US offices later this year as we continue to build our presence across the UK, US and global mobile markets. 
  The opportunity We are looking for a Front-End Developer to help build the next generation of real-time sports visualisation and interactive rendering systems across our broadcast, consumer and performance products. 
This role is focused on developing modern web-based front-end systems capable of rendering live sports data in real time. These systems will power everything from broadcast graphics and analysis tools through to immersive fan and athlete experiences. 
You will play a key role in designing, developing and maintaining a shared rendering platform that can be integrated throughout Rezzil’s product ecosystem. Alongside this, you will contribute to the wider front-end development of our web applications, internal tooling and product interfaces. 
We are looking for someone who enjoys solving complex real-time visualisation challenges, has strong React experience and is excited by interactive 3D and web graphics technologies such as Three.js and WebGL. What you’ll do

• Design and develop scalable front-end applications using React and modern JavaScript or TypeScript. 
• Build and maintain a real-time web-based rendering system for sports data visualisation. 
• Develop interactive graphics and visual experiences using Three.js, WebGL and related technologies. 
• Integrate live sports data feeds into responsive rendering pipelines. 
• Collaborate with back-end developers working primarily across Laravel, PHP and NodeJS environments. 
• Contribute to front-end architecture, reusable component systems and UI standards across products. 
• Optimise rendering performance for real-time applications and live data environments. 
• Work closely with product, design, broadcast and sports performance teams to deliver new features. 
• Support the wider development of Rezzil’s web applications, internal tools and product interfaces. 
• Help shape the technical direction of Rezzil’s front-end and rendering platforms.

What we’re looking for

• Strong commercial experience with React. 
• Solid JavaScript and/or TypeScript experience. 
• Experience building complex front-end applications and component architectures. 
• Experience with Three.js, WebGL or real-time rendering technologies. 
• Strong understanding of real-time data handling, state management and performance optimisation. 
• Experience integrating APIs and live data streams, such as WebSockets or real-time event systems. 
• Strong CSS knowledge, with the ability to build responsive, maintainable and polished interfaces. 
• Good UI/UX awareness and strong attention to detail. 
• Comfortable working with Git, modern front-end build tools and development workflows. 
• Ability to work collaboratively across multidisciplinary teams, including engineering, design, product, broadcast and sports performance. 

Nice to have

• Experience working alongside Laravel, PHP or NodeJS back ends. 
• Experience within sports technology, broadcast graphics, live production or data visualisation environments. 
• Familiarity with animation systems, shaders or GPU-accelerated rendering. 
• Knowledge of video, graphics or real-time media pipelines. 
• Experience with cloud-hosted or scalable web applications. 
• Understanding of data visualisation techniques for sports analytics. 
• Experience with Tailwind or similar CSS frameworks. 
• An interest in sport, gaming, VR, broadcast, computer vision or AI-led products.

What success looks like

• Rezzil has a reliable, scalable front-end rendering platform that can be used across multiple products.
• Live sports data is translated into clear, performant and visually engaging web-based experiences. 
• Broadcast, performance and consumer products benefit from shared front-end components, tools and rendering standards.
• Real-time applications run smoothly, with strong performance across demanding visual and data-heavy use cases. 
• The role helps define how Rezzil builds interactive sports visualisation systems across web, broadcast and immersive products. 

What we offer

• Competitive salary + share options. 
• 25 days’ holiday + bank holidays. 
• Christmas closure (3 additional days). 
• Flexible working and hybrid options.