Sayan Saha

Full Stack Developer

Kolkata, India 3+ yrs exp 87 · Excellent

About

Full Stack Developer with 3.5 years of experience building e-commerce and enterprise web applications with React.js, Vue.js, TypeScript, Node.js, Express.js and MongoDB. Built a real-time bidding platform with Socket.io, cut initial load time by 30% on an enterprise AI product, and shipped several full-stack products end to end, from REST API design and JWT authentication to deployment.

Skills & Expertise (36)

React.js Advanced

8.5/10

Years Exp

REST APIs Advanced

8.0/10

Years Exp

Node.js Advanced

7.8/10

Years Exp

Typescript Intermediate

7.5/10

Years Exp

Vue.js Intermediate

7.5/10

Years Exp

Git Intermediate

7.0/10

Years Exp

MongoDb Intermediate

7.0/10

Years Exp

Jest Intermediate

6.5/10

Years Exp

Tailwind CSS Intermediate

6.0/10

Years Exp

Cross-Browser Compatibility Antigravity Webpack Vite Axios React Testing Library Chrome DevTools Vercel Render Claude Code Codex Cursor Javascript (ES6+ Responsive Design State Management lazy loading code splitting Socket.IO JWT Authentication Express.js Material UI React Router Context API Redux Toolkit REDUX CSS3 HTML5

Work Experience

Frontend Developer (Full Stack scope)

BFS Retail Services Pvt Ltd.

Feb 2025 - Jul 2026

Built the BidForSale.com e-commerce platform with React.js, Redux and Material UI, optimizing component rendering for faster page loads. Developed real-time bidding with Socket.io and automated transaction workflows, managing asynchronous state across frontend and backend. Built backend REST APIs with Node.js, Express.js and MongoDB for product catalog management, with JWT-based authentication, consumed on the frontend via Axios. Refactored the frontend into reusable components, reducing code duplication and improving maintainability.

Software Developer

Global IDs

Jun 2023 - Nov 2024

Reduced initial load time by 30% using lazy loading, code splitting and efficient global state management. Built reusable, cross-browser compatible UI components in Vue.js and React.js for the Enterprise AI module. Revamped the Data Quality feature by integrating complex REST endpoints, with protected routes, dynamic data visualization and robust error handling. Developed advanced form validation and responsive data tables, improving data-entry accuracy and task completion rates by 25%.

Graduate Engineer Trainee

Sterlite Technologies Ltd.

Jul 2022 - Mar 2023

Built and deployed responsive Captive Portal interfaces consuming APIs, with consistent cross-device performance. Secured authentication flows for WiFi AAA products by handling session tokens safely; maintained 99% uptime on front-end applications using Chrome DevTools for profiling and debugging.