Front End Developer (React.js)

CustomerLabs Inc; Chennai; On-site; INR 1,000,000 - 1,200,000; Full time

Benefits offered by this job

Growth opportunities

Work-life balance

Mentorship

Job summary

CustomerLabs Inc is looking for a Frontend Engineer in Chennai, India, to create pixel-perfect responsive designs and optimize web performance. You'll be responsible for building scalable component systems while collaborating with cross-functional teams. Ideal candidates should demonstrate strong experience in performance optimization and UI engineering. This role impacts user satisfaction and ensures high-quality interfaces through a clean and efficient codebase.

Qualifications

• Proven ability to ship responsive UI with high quality and strong performance.
• Strong ownership, attention to detail, and a high bar for UX quality.
• Clear communication and collaboration with cross-functional partners.

Responsibilities

• Deliver pixel-perfect, mobile-first experiences across breakpoints and devices.
• Build scalable component systems and maintain clean frontend architecture.
• Profile and optimize React rendering, bundle size, and runtime performance.

Skills

Responsive design

Performance optimization

Core Web Vitals

Web APIs

Data Structures & Algorithms

Job description

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

Position Overview:

Yesterday is history, tomorrow is a mystery, but today is a gift. That's why we call it the present. - Master Oogway

"Sometimes you gotta run before you can walk." - Iron Man (and sometimes you optimize the render before you ship the feature.)

What You'll Do

• Own responsive design: Deliver pixel-perfect, mobile-first experiences across breakpoints and devices.
• Performance optimization: Improve loading, rendering, and runtime performance using profiling tools and best practices (code splitting, memoization, caching, optimizing assets).
• Deliver strong Core Web Vitals: Monitor and improve LCP, INP, CLS and build performance budgets into day-to-day decisions.
• Build Progressive Web App features: Offline-ready experiences, caching strategies, installability, service workers, and resilient UX patterns.
• Collaborate cross-functionally: Work closely with Product, Design, and Backend to translate requirements into scalable frontend systems.

Why This Role Matters

"I can do this all day." - Captain America (and you'll want to, because great UX is addictive.)

You'll be the person who turns complex product needs into simple, fast, and beautiful experiences. Your work directly impacts user satisfaction, conversion, retention, and trust; because on the web, every millisecond and every interaction matters.

Key Responsibilities

UI Engineering & Frontend Architecture

• Build scalable component systems and maintain clean frontend architecture.
• Write maintainable code with clear abstractions and well-defined component APIs.
• Collaborate on design systems and UI consistency patterns.

Performance, Reliability & Web Vitals

• Profile and optimize React rendering, bundle size, and runtime performance.
• Improve Core Web Vitals and prevent regressions through measurement and guardrails.
• Ensure stable behavior under real-world conditions (slow networks/devices).
• Implement responsive layouts and robust UI states (loading/empty/error).

Testing, Quality & Delivery

• Participate in code reviews and uphold engineering standards and best practices.

Debugging & Web Platform Excellence

• Build features leveraging modern Web APIs and progressive enhancement strategies.

Required Qualifications

Experience

• Proven ability to ship responsive UI with high quality and strong performance.

Technical Skills (Must Have)

• Data Structures & Algorithms: strong problem solving and ability to apply it to frontend performance and correctness.
• Responsive design: mobile-first layouts, modern CSS, and UX-first thinking.
• Performance optimization: profiling + improvements with measurable outcomes.
• Core Web Vitals: understanding and real-world optimization approaches.
• PWA fundamentals: and knowledge of offline/caching/service worker concepts.
• Web APIs: knowledge and practical application.

Soft Skills

• Strong ownership, attention to detail, and a high bar for UX quality.
• Clear communication and collaboration with cross-functional partners.
• Continuous learning mindset; curiosity about the web platform.

Preferred Qualifications (Nice to Have)

• Accessibility knowledge (semantic HTML, keyboard navigation, ARIA basics).
• Experience with performance monitoring/analytics and error tracking in production.
• Interest in vibe coding: rapid prototyping and tool-assisted development; without compromising quality.

Interview Process (Sample)

1. Initial Screening: HR + role alignment

3. DSA Round: problem solving (time/space complexity, clean reasoning)

4. Practical Round: small UI feature with performance + testing expectations

5. Final Interview: collaboration, ownership, and growth discussion

Our Team Culture

"We are Groot." - We work together, we grow together, we succeed together.

We believe in:

• Innovation First: ship, learn, improve; then ship better.
• Team Over Individual: strong reviews, shared ownership, no silos.
• Continuous Learning: the web evolves; we evolve with it.
• Making a Difference: quality UX changes how users feel about a product.

Growth Journey

Your journey with us will be like leveling up from building components to building systems:

• Level 1: Master our UI patterns and platform foundations.
• Level 2: Own features end-to-end with great testing and performance.
• Level 3: Lead complex frontend initiatives and mentor others.
• Level 4: Become a frontend specialist who raises standards across the org.

What We Promise

• Work that matters; real user impact
• Growth opportunities: tools, mentorship, and challenging problems
• Work-life balance; sustainable pace, high quality