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Full Stack Developer

Hi, I'm
Khalid Hasan

I build modern, scalable web applications using React, Node.js, and MongoDB — from real-time auction platforms to secure university systems.

Khalid Hasan
Available for work

Developer & Problem Solver

Full Stack developer based in Dhaka, Bangladesh. I build production-ready web platforms and maintain internal university systems.

I'm a Full Stack Web Developer with hands-on experience in building scalable applications end-to-end — from real-time auction systems with Socket.io to OTP-based auth flows and automated payment pipelines.

I work as a developer at North South University, where I maintain and harden internal systems. I also independently run AuctionsBD, a live production auction platform serving real users.

My focus areas include clean architecture, API security, real-time communication, and delivering smooth user experiences across web and Android.

2+
Years Building
4+
Projects Shipped
1
Live Platform
🎓
University Developer — NSU
Bug fixes & security hardening on internal systems at North South University, Dhaka
🚀
Founder — AuctionsBD
Built and deployed a full-stack auction platform with real-time bidding, SSLCommerz payments, and email automation
📱
Android Development
Building native Android apps with Kotlin, Retrofit, Socket.io, and FCM push notifications
🔒
Security-Focused
Experienced in security audits, IPN signature validation, rate limiting, and dependency hardening

What I Work With

Proficiency across the full stack — frontend, backend, mobile, and DevOps.

JavaScript (ES6+)90%
React / Vite88%
Node.js / Express85%
REST APIs & Auth88%
MongoDB / Mongoose80%
Socket.io (Real-time)75%
Android / Kotlin65%
Git / Railway / Vercel78%
React Vite Node.js Express.js MongoDB Mongoose Socket.io JWT SSLCommerz Nodemailer Kotlin Retrofit FCM Railway Vercel Git

Projects I've Built

From live production platforms to internal tools — shipping real software for real users.

Internal System

NSU Developer Portal

As an internal developer at North South University, I maintain and harden the university's web systems (rds3.northsouth.edu). Work includes bug fixes, SSL certificate management, brute-force protection, and security audits.

Web Security SSL Bug Fixes
Built

UIU Faculty Review Platform

A platform for UIU students to review and rate faculty members, share experiences, and rate courses. Includes a full review system, JWT authentication, and admin moderation tools.

React REST API MongoDB JWT
Built

Task Manager REST API

A backend REST API for task management with JWT authentication, full CRUD operations, user-scoped data isolation, and a clean, scalable architecture designed for frontend consumption.

Node.js Express MongoDB JWT

Let's Build Together

Have a project idea or want to collaborate? Reach out — I'm always open to interesting work.