# About

By Saurabh Kumar · Principal Engineer, Fueled

Source: https://saurabh-kumar.com/about/

> I build AI systems, study how agents do real work, and figure out what's worth building.

I've been writing code since school. In college I built conference websites and designed and built my university's website on Joomla. I joined Fueled in 2012 as a web developer, and moved from PHP to Python and Django.

For the past fourteen years I've built backends: patient portals, a learning platform for Apple's retail staff, grant platforms for nonprofits, and subscription and media apps. At Fueled I grew from developer to backend lead, then led the web engineering practice as a director, where the team grew from 8 to 16 across infrastructure, DevOps, platform, front end and back end.

In March 2026 I moved from managing people to managing technology, as Principal Engineer. I lead engineering on [Rosey](https://meetrosey.ai), Fueled's AI-native delivery platform, in a small team of senior engineers, and help Fueled's teams and clients put AI agents to work. I also support technical sales, and work on engineering foundations, such as RFCs for technical decisions.

More of my time now goes to research and product questions: how agents remember, retrieve, and get checked; how to build evals that catch real failures; and, as code gets cheaper to write, how to decide what's worth building and how to tell it worked. Some of it turns into tools, like [Pi Pocket Blackhole](https://github.com/theskumar/pi-pocket-blackhole) for long agent sessions. [Projects](https://saurabh-kumar.com/projects/) has the full list, and my [TIL notes](https://saurabh-kumar.com/til/) catch what I learn along the way.

I've written open source since 2013. I started [python-dotenv](https://github.com/theskumar/python-dotenv) in 2014 after a credential leak at work, and helped maintain [cookiecutter-django](https://github.com/cookiecutter/cookiecutter-django). I revived the [PyDelhi](https://pydelhi.org) meetup and ran it from 2014 to 2018, and co-founded Essentia SoftServ, a small software firm, where I was a part-time partner until 2022.

Off the clock, I'm on the outskirts of Delhi with my wife, my son Amay, and our dog [Hachi](https://instagram.com/hachi.softysingh), who all do a fine job of keeping me away from the keyboard.