On-site Frontend Engineer: GSAP & Three.js with React/Next

Kofeko; Test Valley; On-site; GBP 45,000 - 65,000; Full time

Job summary

Kofeko in the United Kingdom is seeking a frontend developer with 3–5 years of experience to build responsive, pixel-perfect interfaces using React.js and Next.js. You will translate designs into high-quality frontend implementations, delivering modern animations and interactive experiences with GSAP and Three.js, while keeping code clean and well-documented.

You will collaborate with UI/UX designers and backend developers, optimize for performance and SEO, ensure cross-browser compatibility,

Qualifications

• 3–5 years of frontend development experience.
• Strong expertise in HTML5, CSS3, JavaScript (ES6+), React.js, and Next.js.
• Ability to convert designs into pixel-perfect, responsive frontend implementations.
• Experience with Bootstrap, Tailwind CSS, MUI, and SCSS.
• Familiarity with GSAP and Three.js for production animations.

Responsibilities

• Develop responsive, cross-browser web applications using HTML5, CSS3, JavaScript, React.js, and Next.js.
• Convert design files (Figma/XD/PSD) into pixel-perfect, responsive interfaces.
• Build reusable UI components aligned with modern frontend architecture.
• Implement responsive layouts using Bootstrap, Tailwind CSS, MUI, and SCSS.
• Create animations and interactive UI using GSAP and Three.js for production experiences.
• Optimize for speed, SEO, Core Web Vitals, and overall performance.
• Collaborate with UI/UX designers and backend developers; maintain and enhance existing apps.
• Use Git/GitHub for version control and write clean, maintainable code.

Skills

HTML5

CSS3

JavaScript ES6+

React.js

Next.js

GSAP

Three.js

Education

Bachelor's degree in Computer Science or related

Tools

Bootstrap

Tailwind CSS

Material UI (MUI)

SCSS

Git/GitHub

Job description

Kofeko in the United Kingdom is seeking a frontend developer with 3–5 years of experience to build responsive, pixel-perfect interfaces using React.js and Next.js. You will translate designs into high-quality frontend implementations, delivering modern animations and interactive experiences with GSAP and Three.js, while keeping code clean and well-documented.

You will collaborate with UI/UX designers and backend developers, optimize for performance and SEO, ensure cross-browser compatibility,