Lakshay Mahajan

LM

Looking for a job

Lakshay Mahajan

@lakshaymahajan

Backend developer building secure, scalable Node.js platforms with payment and auth expertise.

What I'm looking for

I want to build backend systems that handle real payments and auth securely, with clean microservice architecture and cloud automation. I’m excited to work on event-driven platforms, reliable deployments, and engineering that prevents production issues.

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.

Experience

Work history, roles, and key accomplishments

IN

Current

Backend Developer

Current

Internware

Oct 2024 - Present (1 year 6 months)

Engineered an event registration backend handling 800+ registrations per event and integrated Cashfree payments; prevented revenue loss by fixing a client-side payment calculation vulnerability with server-side validation and webhook verification. Built internal admin tools (permission-based dashboard, real-time attendance tracking) and a flexible coupon system, and migrated authentication from Fi

MongoDB Cashfree API JWT Webhooks Server Side Input Validation

Education

Degrees, certifications, and relevant coursework

GU

Guru Gobind Singh Indraprastha University

Bachelor of Computer Application, Computer Applications

2023 - 2026

Grade: 9.1/10.0

Pursuing a Bachelor of Computer Application (BCA) degree with a GPA of 9.1/10.0.

PS

Prince Public School

Class 12, Higher Secondary Education

Grade: 8.9/10.0

Completed Class 12 education with a GPA of 8.9/10.0.

Tech stack

Software and tools used professionally

Postman

GitHub

GitHub Actions

MongoDB

Gmail

Node.js

JavaScript

Linux

Firebase

AWS Lambda

Zod

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