Backend Software Engineer

Hi, I’m Vijay — I build the stuff behind the stuff you use.

I’m a software engineer who enjoys figuring out what happens behind the scenes and turning messy problems into simple, reliable solutions. I spend most of my time building products and learning how things work.

This is where I share what I’ve built, what I’ve learned, and a few things I found interesting along the way.

Journey

See projects

5+ yrs backend

Open-source maintainer

Technical writer

Selected Work

Projects I’ve shipped and open-sourced

More projects

Java · Spring Boot · Instagram API · Inspired by SharkTank India

WYLD-Algorithm — Turning Posts Into Cashback Decisions

A backend service that checks Instagram posts against campaign rules and decides whether a post qualifies for cashback.

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Next.js · TypeScript · Supabase · Twilio · Inspired by SharkTank India

Scan2Call — Private Calling, Without Sharing Numbers

A privacy-first calling system that lets someone connect with you by scanning a QR code — without exposing either person's phone number.

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Skills & Expertise

The tools and ideas I use to turn problems into working systems.

Backend Engineering

Java, Kotlin, and Spring Boot — building clean, reliable services that are easy to evolve.

Microservices

Breaking complex systems into focused services that can grow and change independently.

System Design

Breaking complex problems into simple, reliable pieces that work well together.

Cloud Messaging

AWS, Kafka, and Redis — connecting services and keeping data moving where it needs to go.

Databases

Designing schemas, working with SQL, and finding ways to make data-heavy operations faster.

Quality & Reliability

Testing and monitoring — because “it works on my machine” isn't good enough.

Recent Writing

Notes on engineering, in public

Backend

6 min read

Designing Idempotent APIs for Payment Systems

Why idempotency keys aren't optional once money is involved, and how I wire them into Spring Boot services without leaking complexity into business logic.