Welcome to my portfolio

Hello, I'm Vignesh Kumar

Frontend Development Engineer at Victoria's Secret & Co

7s → 2s

Cart Operations Optimization

99.9%

POS System Uptime

25%

Team Delivery Speed Increase

Vignesh Kumar
Full-Stack
React & Node.js

Technical Expertise

With ~6 years of experience, I've developed expertise across the full-stack spectrum, from React ecosystem to backend services, cloud infrastructure, and emerging AI technologies.

Frontend

React.js95%
Next.js90%
React Native85%
TypeScript90%
JavaScript95%
HTML5/CSS390%
PWAs80%

Backend & APIs

Node.js85%
Express.js80%
REST APIs90%
WebSocket75%
GraphQL70%

Databases & Cloud

PostgreSQL80%
MongoDB75%
AWS Lambda75%
AWS S3/EC270%
Vercel80%

State Management & Tools

Redux85%
Context API90%
Recoil75%
Module Federation80%
Webpack/Vite75%

Testing & DevOps

Jest/Vitest80%
React Testing Library75%
GitHub Actions80%
CI/CD85%
Sentry70%

AI/ML & Emerging

Generative AI65%
LLMs60%
Prompt Design70%
AI Integration65%

Professional Journey

A timeline of my professional experience and key achievements in building scalable web applications and leading development teams.

Frontend Development Engineer

Victoria's Secret & Co

December 2023 - August 2025
  • Developed POS application from scratch with React, React Native, Node.js/Express, and PostgreSQL serving million+ customers daily
  • Architected Context Provider-based state management reducing re-renders and streamlined common component conventions for scalability
  • Implemented Node.js WebSocket service fetching product data on barcode scans, cutting lookup latency significantly
  • Optimized cart operations from 7s → 2s via memoization and state restructuring; enhanced TypeScript strictness and CI testing (80%+ coverage)
  • Identified and resolved critical performance and security gaps; raised PRs, documented improvements, and gained leadership approval
  • Mentored 5 junior developers, established coding standards, and improved delivery speed by 25%
React.jsReact NativeNode.jsExpress.jsPostgreSQLWebSocket

SDE-II

ShopUp

March 2022 - December 2023
  • Engineered component library used by 6+ teams, reducing development time by 35%
  • Orchestrated micro-frontend architecture via Module Federation enabling 5+ teams to collaborate independently
  • Automated CI/CD pipelines reducing release cycles from 2 hours → 30 minutes with zero downtime
  • Redesigned real-time analytics dashboards and engineered role-based access control (5 tiers) improving reporting by 60%
React.jsModule FederationComponent LibraryCI/CDAnalytics

Program Analyst

Cognizant Technology Solutions

May 2019 - March 2022
  • Reduced API latency by 30% via caching and React hook optimization
  • Decreased JS bundle size by 60% using tree-shaking, minification, and code splitting, boosting initial rendering by 45%
  • Delivered 95% of sprint goals consistently across 8 quarters maintaining code quality standards
React.jsJavaScriptCachingBundle OptimizationREST APIs

Featured Projects

A showcase of my professional experience and personal projects, demonstrating expertise in enterprise POS systems, micro-frontend architecture, full-stack development, and innovative Chrome extensions.

Enterprise POS System

Enterprise POS System

Lead Developer8+ developers

Lead developer for POS application deployed across 800+ stores with 99.9% uptime and offline-first workflows handling $50K+ daily transactions.

ReactReact NativeNode.jsPostgreSQLWebSocket
  • Serving million+ customers daily
  • 99.9% uptime with offline-first workflows
  • Integrated 5+ payment gateways
  • Real-time inventory sync reducing stock discrepancies by 45%
  • Boosted Core Web Vitals and SEO with Next.js edge SSR
ShopUp CMS Platform

ShopUp CMS Platform

Senior Developer12+ developers

Senior developer contributing to enterprise CMS supporting 50K+ SKUs with admin panel for 200+ daily users; integrated GraphQL with React and real-time analytics dashboards.

ReactGraphQLModule FederationReal-time Analytics
  • 50K+ SKUs management
  • 200+ daily active users
  • Real-time analytics dashboards
  • Role-based access control (5 tiers)
  • Reduced reporting time by 60%

Open Source Contributions

Actively contributing to open source projects and building new technologies. Currently focused on educational technology and AI integration.

Currently Building

TheGoodGameTheory

TheGoodGameTheory

Building an AI-powered game-based learning platform that revolutionizes education through interactive experiences. Combining cutting-edge AI technology with gamification to create engaging educational content.

AI/MLReactTypeScriptNode.jsGame Development

1200+

Total Commits

80+

Repositories

150+

Stars Earned

Let's Connect

Full-Stack Engineer with ~6 years of experience building scalable web and mobile applications. Expertise in React.js, Next.js, Node.js/Express, PostgreSQL, and AWS. Let's discuss how we can work together!