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Hemant kumar

@hemantkumar8

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Senior Frontend Engineer building accessible, high-performance React and Next.js products.

India

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What I'm looking for

I’m looking for a role where I can build accessible, high-performance React/Next.js products, own frontend architecture and performance, and collaborate with product and design teams. I’m excited to ship measurable improvements and lead UI engineering in agile, distributed teams.

I’m a Senior Frontend Engineer with 12+ years of professional experience building high-performance, scalable React and Next.js applications for global products. I focus on architectural design, performance optimization, and accessible UI implementation (WCAG 2.1 AA), consistently improving Core Web Vitals and Lighthouse outcomes.

I’ve led major UI efforts end-to-end—from responsive, mobile-first interface redesigns to building reusable component ecosystems (50+ components) that improve frontend efficiency by 40%. I also strengthen reliability through automated unit and integration testing with Jest and React Testing Library, plus thorough code reviews and performance profiling.

As founder & lead engineer of CopyJet, I engineered a production-ready AI SaaS platform from scratch—integrating Google AI APIs, building secure multi-tenant authentication with Supabase (RLS), and implementing Stripe subscription billing with multi-scenario webhooks. I enjoy leading cross-functional teams in distributed, agile environments to ship measurable, user-centered outcomes.

Experience

Work history, roles, and key accomplishments

Current

Founder & Lead Engineer

Current

Copyjet

Jan 2024 - Present (2 years 5 months)

Founded and engineered a production-ready AI SaaS platform from scratch using Next.js, TypeScript, Tailwind CSS, and MySQL. Integrated Google AI APIs for real-time copy generation and implemented secure multi-tenant auth with Supabase RLS plus Stripe subscription billing and CI/CD via Vercel, achieving Lighthouse scores of 96 Performance, 100 Accessibility, 92 Best Practices, and 96 SEO.

Next.js TypeScript Tailwind Supabase Stripe Subscriptions & Webhooks CI CD Docker Lighthouse Optimization

Current

Frontend Developer

Current

Advanced Thermal Solutions (ATS)

Mar 2023 - Present (3 years 3 months)

Architected and optimized responsive React/TypeScript interfaces, improving Core Web Vitals and page load speeds by 35%. Led accessible, mobile-first layouts meeting WCAG 2.1 AA standards, created an internal library of 50+ reusable components, and reduced dev time by 40% while writing Jest/React Testing Library tests to maintain reliability.

React TypeScript WCAG 2.1 AA Responsive UI Jest React Testing Library Component Libraries

React Developer

Cu Rise Analytics (Trellance)

Nov 2021 - Feb 2023 (1 year 3 months)

Built data-intensive fintech/analytics web applications with React, Redux, and Material UI, eliminating redundant re-renders by 45%. Optimized global state and network usage using Redux Saga (30% fewer API calls) and improved bundle performance with code-splitting and Webpack changes, reducing bundle size by 32%, while maintaining 85% automated Jest test coverage and lowering regressions by 42%.

React Redux Redux Saga Material UI Webpack Code Splitting & Lazy Loading Performance Optimization Jest React Testing Library Bundle Size Optimization

UI Design Team Lead

Vagaro Technologies Pvt. Ltd.

Sep 2020 - Nov 2021 (1 year 2 months)

Led a UI design and frontend engineering team, running sprint planning, performing code reviews, and mentoring junior engineers. Spearheaded frontend implementation for web and mobile interfaces used by 100k+ global salon and spa businesses, translating product specs into pixel-perfect, scalable UI code with international Product Managers.

UI Engineering Code Review Sprint Planning Mentoring Cross Functional Collaboration Agile Delivery Pixel Perfect UI Implementation Responsive UI Accessibility Minded Development

Senior UI/UX Designer

PhpDots Technology

Apr 2019 - Sep 2020 (1 year 5 months)

Designed and engineered high-fidelity responsive websites and applications using Figma, JavaScript, and Bootstrap. Improved cross-team productivity by creating modular design tokens and interactive prototypes to reduce design-to-engineering handoff friction.

Figma JavaScript Bootstrap Responsive Web Design Design Tokens Prototyping UI Engineering