SWAPNANEEL KUNDU

Software Engineer | Full MERN Stack Developer

About Me

I'm a Full-Stack Web Developer (MERN) passionate about building scalable, real-time, and AI-powered web applications. What I've built & delivered: Architected a microservices file-processing system (Node.js, AWS S3, Python Celery) — reduced processing time by 65% across 5,000+ files Integrated Gemini Flash & ChatGPT Turbo for AI-driven file analysis via REST APIs — achieved a 99.5% job success rate and improved responsiveness by 40% Built the complete SaaS backend for Hosla Foundation (NGO for senior citizens' mental health) — 20+ modular RESTful APIs, JWT auth, supporting 120+ concurrent users Contributed to SHRADHAA — digital tools for emotional well-being in elderly communities Cut developer onboarding time by 50% through clean, modular Express architecture Reduced debugging time by 40% via Winston logging & error monitoring integration Projects: Real-time location tracker & routing system (Socket.IO + Leaflet) Multiplayer chess game (Socket.IO + chess.js) LuxeCarry — e-commerce app with Google OAuth, Stripe payments, Cloudinary & JWT sessions Tech Stack: React.js · Node.js · Express.js · MongoDB · Socket.IO · Tailwind CSS · AWS S3 · Python · WebRTC · Git · Postman I write clean, maintainable code and care deeply about solving problems that matter in the real world.

Experience & Education

  • December 2025 – Present

  • Full-Stack Developer

    Freelancing

  • February 2025 – November 2025

  • Software Developer

    Hosla and Shraddha Foundation

  • 2025

  • B.Tech Computer Science

    Kazi Nazrul University, Asansol

Skills and Proficiencies

Technical Skills

React.js, Tailwind CSS, JavaScript (ES6+), HTML5, CSS3, Node.js, Express.js, Socket.IO, MongoDB, SQL, OOPs,Computer Networks, Git, GitHub, Postman,Docker

Languages

English, Bengali, Hindi

Featured Projects

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e-commerce with google oath, stripe, cloudinary intregation, Demo Login: demo@example.com | Password: pass123

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Real-Time Location Tracking and Routing with Node.js, Express, Socket.IO, Leaflet, and Leaflet Routing Machine

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A real-time multiplayer chess application socket.io and chess.js with realtime player and spectator,with prevention of false moves

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My Backend Architecture Journey at Hosla

When you're building a real-world software product, especially in a team setting, your backend architecture often evolves with time. That’s exactly what happened to me while developing the backend for Hosla, a mental health platform that involves machine learning prediction, chatbots, user authentication, and social interactions.....

How to Integrate Stripe Payment Gateway in Node.js

Stripe is one of the most popular and developer-friendly payment gateways available today. It enables you to accept online payments securely and effortlessly. In this tutorial, I’ll show you how to integrate Stripe into a Node.js backend application from scratch. By the end of this guide, you will be able to accept payments via Stripe with a simple API endpoint.

Docker Makes life of Developer Easy!!!!

Docker is a containerization platform. A container packages your application along with everything it needs to run — the runtime, libraries, environment variables, config files — into one isolated unit. No more broken dependencies. No more "it ran fine locally but crashes in production." Here's why Docker has become non-negotiable for modern development: Environment Consistency — Your app runs identically on your laptop, your teammate's machine, your staging server, and your production VPS. The container is the environment. Isolation — Each service (your Node.js app, your PostgreSQL database, your Redis cache) runs in its own container. They don't interfere with each other, and they don't pollute your host OS.

How we integrate Cloudinary with Multer in node js app saving the url in MongoDB

Alright — let’s break it down step-by-step so you not only know how to integrate Cloudinary with Multer in a Node.js app, but also why each step is done, and how to store the image URL in MongoDB. We’ll go through: Understanding the tech stack Project setup Cloudinary configuration Multer setup Integration logic Saving URL to MongoDB Example complete code Flow explanation 1️ Understanding the Stack Multer → Middleware for handling multipart/form-data (file uploads) in Node.js. Cloudinary → Cloud-based image & video storage service. MongoDB → Database to store image metadata (like URLs) instead of the actual image file. Mongoose → ODM for MongoDB. Flow: Client sends an image in a POST request. Multer temporarily stores it in memory or a temp folder. Cloudinary’s SDK uploads that image from memory/temp folder to the cloud. Cloudinary returns a secure_url. Save that URL in MongoDB. Cloudinary Configuration Go to Cloudinary → Create a free account. Get your cloud name, API key, and API secret from the Dashboard. Create .env file Multer Setup Here we use memory storage so we can send the file directly to Cloudinary without saving it locally.

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