Lakshay Mahajan

I’m a Backend Developer focused on building secure, high-throughput web systems. At Internware, I engineered an event registration platform handling 800+ registrations per event and implemented secure payment processing using Cashfree API with Node.js, Express, and MongoDB.

I also strengthen reliability by hunting real production issues—like fixing a client-side payment calculation vulnerability and redesigning the architecture with server-side validation and webhook verification. Beyond core payments, I built internal admin tools, including a permission-based dashboard, real-time attendance tracking, and controlled data-entry forms to keep a single source of truth across teams.

In parallel, I create reusable backend services through projects like my Authentication Service microservice (Node.js/Express/MongoDB) using AWS SNS/SQS/Lambda for event-driven email delivery, structured logging, idempotency, and DLQ recovery. I migrated authentication from Firebase to custom Google OAuth with JWT session management, and I enjoy sharing what I learn through technical deep-dives on SSL certificates, OAuth 2.0, and UPI systems.