Not a fan of long JDs? take a minute to watch our video JD, it’ll give you a real feel of the role, growth and glimpse of your manager as well here : https://tinyurl.com/3wzr5nty About CustomerLabs CustomerLabs is a fast-growing B2B SaaS company helping businesses maximize the value of their first-party customer data. Our platform helps marketers collect, unify, and activate customer data to improve marketing performance and drive measurable growth. About the Role You'll turn complex product requirements into fast, reliable, and delightful web experiences. You'll build reusable UI with React and JavaScript, care deeply about responsive design and performance, and ship with strong testing and browser compatibility. What You'll Do · Build reusable UI components and frontend features using JavaScript, React, HTML5, and CSS3. · Deliver responsive, mobile-first, pixel-accurate experiences across devices. · Ensure consistent behavior across Chrome, Safari, Firefox, and Edge. · Profile and optimize loading, rendering, bundle size, and runtime performance. · Improve Core Web Vitals and build performance guardrails into everyday development. · Write unit/component and automated browser tests to prevent regressions. · Use DevTools to diagnose network, performance, memory, layout, and rendering issues. · Build features using modern Web APIs and Progressive Web App patterns. · Collaborate with Product, Design, and Backend on scalable frontend systems. Must-Have · Strong hands-on experience building production web applications with React and JavaScript. · Deep fundamentals in JavaScript, React, HTML, and CSS. · Strong problem-solving and DSA fundamentals applied to frontend performance and correctness. · Responsive, mobile-first design and modern CSS knowledge. · Practical cross-browser debugging experience. · Performance profiling and measurable optimization experience. · Unit testing and automated browser testing experience. · Understanding of Core Web Vitals, Web APIs, browser DevTools, and PWA fundamentals. · Strong ownership, communication, collaboration, and attention to UX quality. Good to Have · TypeScript. · Accessibility knowledge including semantic HTML, keyboard navigation, and ARIA basics. · Production performance monitoring, analytics, and error tracking experience. · Interest in rapid prototyping and tool-assisted development without compromising quality. Success in This Role · Features are fast, reliable, responsive, accessible, and tested. · Frontend architecture becomes easier to scale and maintain. · Users experience a smoother product because performance and UX are treated as engineering priorities. ​ Why CustomerLabs? Welcome to the Average Kootam — A place where you’re trusted to own your work, make decisions, learn from the experience, and keep moving forward. You’ll know what you’re working towards, have the freedom to grow into bigger responsibilities, and see the impact of what you do. Teams here don’t work in isolation Sales, Marketing, Design, Engineering, and others work closely, challenge ideas, and build better things together. And when we’re not building, we make time to learn, connect, have fun, and bring the whole Kootam together. Wanna know more about us? Connect with us: We're active on LinkedIn, Instagram talking about what we do at CustomerLabs. Would you like to know our stories? Catch up on what we're up to on the LinkedIn page of our HR Team - Devarshini, Aswin, Kunguma! Take a sneak peek at our behind the scenes fun at our team-run Instagram page. Want to bypass all this and get a coffee with us at our office? Let us know here!