Skip to content
Mudassar Hassan

About

I’m a software engineer based in Lahore, Pakistan. I’ve been building web applications for about seven years, mostly in Ruby on Rails, React and JavaScript, and working remotely with distributed teams for most of that time.

Right now I split my time between two engagements. At Intercom I work on the reporting product — external report sharing, scheduled delivery, and the data pipeline behind it. At Kimberly-Clark, through Toptal, I build Node.js APIs for a global customer identity platform and the event-driven pipeline that keeps product data consistent across their brands.

The work I find most interesting sits where product meets infrastructure: a notification platform I helped scale to millions of webhook requests a day, a reporting backfill across a dozen Elasticsearch indices, identity systems that have to be both invisible and correct. Most of what I write about here comes out of that — the problems that only show up under load, and what it actually takes to fix them.

Outside of client work I’m interested in systems-level engineering, and in how far AI-assisted development can be pushed on real production codebases.

The full history is in my CV.

Experience

Current

Intercom — Senior Product Engineer

Mar 2025 – Present

Remote, via Codevolve

Ruby on Rails React TypeScript Elasticsearch

Kimberly-Clark — Senior API Engineer

Oct 2025 – Present

Remote, via Toptal

Node.js Express GraphQL

Previously

PepsiCo — React Front-end Developer

Jan 2025 – Apr 2025

Remote, via Toptal

React TypeScript Next.js

Toptal (Core Team) — Senior Full-stack Engineer

May 2022 – Oct 2024

Remote

Ruby on Rails React GraphQL Kafka Sidekiq TypeScript

Swvl — Senior Software Engineer

Jan 2022 – May 2022

Remote

Node React Next.js TypeScript

Devsinc — Full-stack Engineer

May 2020 – Dec 2021

Lahore

Ruby on Rails React Sidekiq TypeScript AWS React Native Expo

SenSights.AI — Junior Software Engineer

Jan 2020 – Mar 2020

Lahore

JavaScript React React Native

Contact