SWAPNANEEL KUNDU

Software Engineer | Full MERN Stack Developer

About Me

I’m a Full-Stack Web Developer (MERN) with hands-on experience in building scalable and real-time web applications. During my internship, I developed the complete backend for HOSLA, an NGO platform for senior citizens’ mental health, implementing secure JWT auth, REST APIs, and modular Express architecture. I also contributed to SHRADHAA, creating digital tools to support emotional well-being in elderly communities. Beyond internships, I’ve built projects like: A real-time location tracker and routing system (Socket.IO + Leaflet) A multiplayer chess game with socket.io and chess.js LuxeCarry – an e-commerce app with Google OAuth, search, cart & JWT sessions,cloudinary and Stripe payment intregation Tech Stack: React.js, Node.js, Express.js, MongoDB, Socket.IO, Tailwind CSS, WebRTC, Git, Postman I’m passionate about solving real-world problems through clean, maintainable code.

Experience & Education

  • February 2025 – Present

  • Full-Stack Developer

    Hosla and Shraddha Foundation

  • January 2025

  • Software Developer

    CodSoft

  • 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

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

View source code on github
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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.

Restructuring my Ecom Fullstack Project Restructuring my Ecom Fullstack Project

Hey everyone, as I mentioned earlier, I used to work at HOSLA, an NGO startup, where I made the complete back end of the mental health service and also worked on all other services. After working there and applying all my new learnings, when I looked back, I found my personal project was kind of messy — not modular, no custom errors, no custom logs, no global error handler, no async handler (to wrap the function so if an error arrives, it is sent to the global error handler) — just messy try-and-catch blocks. No controllers, just doing all the tasks in the router. I also had to add proper spacing and remove extra commas.

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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