San Francisco  ·  Delhi

Pujun
Bhatnagar

I love traveling to beautiful cities and taking the long way home. This website is a reflection of who I am, what I do in my spare time, and how I got here.

Pujun Bhatnagar
Now listening
Arijit Singh
Last visited
Delhi · India
Currently shooting
Fujifilm X-T6 · Acros simulation
About

Builder.
Nerd.
Photographer.

I grew up with my mom, sister and dad. They taught me to slow down and actually pay attention. To ask questions. To care about the things most people gloss over. That stuck with me.

Math got me when I was a kid and never really let go. I competed for India at the International Mathematical Olympiad, something that sounds more impressive than it felt at the time. I was mostly just a nervous kid who liked numbers. I came home with a Gold Medal in Mathematics and a Silver in Informatics. What those competitions actually taught me was how to sit with a problem and not panic.

I studied Computer Science and AI at Georgia Tech, then did a Master's at Stanford. I worked on ML research while I was there, mostly the unglamorous stuff like making research reproducible. Some of that work was later acquired by Microsoft and became part of the foundation that OpenAI was built on. I got lucky that some of it turned out to matter.

From there I joined Facebook, early on the team that built Stories. I wrote ML ranking systems, the code that decides what content surfaces and when. It ran at large scale. I learned a lot, mostly about what breaks when you're not looking and how much of engineering is just damage control.

In 2023 I left to start Kintsugi AI with my co-founder. We build software that handles sales tax compliance for internet businesses automatically. It's not a glamorous problem, but it's a real one. A lot of founders find out too late that they owe significant back taxes across dozens of states. We're trying to make that not happen.

Looking back, I've been in a lot of places at the right time. The honest version is that luck played a big role. I just tried to take it seriously when it showed up.

When I'm not working, I'm usually wandering some neighborhood with a camera, riding my bike across the Golden Gate, cooking something that takes too long, or going down a rabbit hole on mechanical keyboards and fountain pens.

Still figuring most of it out, honestly.

Based inSan Francisco, CA
UndergradGeorgia Tech, Computer Engineering
MinorsCS · Mathematics · Art History · Music Theory
GraduateStanford MS CS (AI)
AlsoHarvard Business School (left early) · MIT Lecturer
PreviouslyML Engineer, Meta
CompanyKintsugi AI (CEO)
UnwindPhotography
Road cycling
Cooking
Making Coffee
Collecting Pens
Building Keyboards
Favorite FilmsRatatouille
Inception
The Holiday
Favorite MusicVampire Weekend
Backstreet Boys
Michael Jackson
Khalid
Favorite CamerasSony A7ii
Fujifilm X-T6
Favorite BikeTrek Domane
Now
Listening
Arijit Singh
Coffee
Wrecking Ball SF — single origin pour over
Riding
Marin Headlands loop on the Trek Domane
Pen
TWSBI Eco T, Pilot Iroshizuku ink
Shooting
Fujifilm X-T6 · Acros simulation
Reading
What I Talk About When I Talk About Running — Murakami
Experience

Things I've
worked on.

2021 – Present
CEO & Co-Founder
Kintsugi
Building software that automates sales tax compliance for internet businesses. Helps companies stay on top of multi-state obligations before they become a real problem.
Current
2012 – 2021
First ML Engineer at Facebook Stories
Meta (Facebook)
Worked on the ML ranking systems behind Stories across Instagram, Facebook, and WhatsApp. Learned a lot about building at scale and how much can quietly go wrong.
Previous
Education
Stanford University
MS Computer Science, Artificial Intelligence
Georgia Tech
BS Computer Engineering
Minors: CS, Mathematics, Art History, Music Theory
Harvard Business School
Attended but dropped out
MIT
Lecturer and Willems Fellow
Teaching optimization and data decision making to graduate students
Team

The team that crossed an ocean.
Sakura season. All of us.
The people who make it worth it.

Sumida River · Tokyo
Sumida River · Tokyo
Ueno Park · Tokyo
Ueno Park · Tokyo
Shinjuku Gyoen · Tokyo
Shinjuku Gyoen · Tokyo
Senso-ji · Asakusa
Senso-ji · Asakusa
Meiji Shrine · Tokyo
Meiji Shrine · Tokyo