Muhammad Umar

I’m a Full-Stack Developer with 3+ years of hands-on experience architecting and shipping production-grade web applications using the MERN stack. I’m especially focused on real-time systems—WebSocket, Socket.io, and WebRTC—to deliver collaborative experiences that feel seamless for users.

In my recent role as a Front-End Developer at TechExa Digital Services, I engineered responsive React.js frontends integrated with Node.js/Express REST APIs, maintaining consistent performance across Chrome, Firefox, Safari, and Edge. I also owned real-time multi-user collaboration features using WebSocket and Socket.io, enabling synchronized document and data updates for concurrent sessions.

I’ve built and deployed production experiences end-to-end, from REST API design and MongoDB schema architecture to responsive React frontends and cloud deployment. I implemented WebRTC peer-to-peer voice communication so users could collaborate with in-app audio—without relying on third-party plugins or external services.

As a freelance Full-Stack Developer for international clients, I designed, developed, and deployed 8+ end-to-end MERN applications across e-commerce, SaaS, healthcare, and service verticals. I prioritize clean code, measurable performance, and business impact—optimizing Lighthouse metrics and Core Web Vitals through code splitting, lazy loading, and asset optimization.