Hi, I’m Kristian.

I program in Python and Ruby, enjoying especially web development in Rails and machine learning engineering in Python.

In my free time, I ski and snowboard in winter, and hike and cycle in summer.

Me, formal
Me, normal

Recent Projects

machine learning engineering · python · pytorch


Maze is an applied reinforcement learning framework built for real-world projects. I help design and build it as part of the amazing team at EnliteAI.

Ecommerce Pot
web development · javascript · rails · shopify

Ecommerce Pot

Ecommerce Pot is a Shopify agency that I co-founded. We provide development and marketing services for merchants and build custom Shopify apps.

shopify app · rails · stimulus · polaris


SocialSeal auto-generates professional thumbnail images for products, collections and blog posts based on a custom configurable template.

shopify app · rails · stimulus · polaris


CopyCrab helps merchants turn a list of product benefits and keywords into a compelling product description.

web development · rails · tailwind · stimulus


Paperback is a simpler and tidier alternative to wiki pages. Surface information in your team in conscise lists instead of getting lost in deeply nested hierarchies.

L2RPN 2022
machine learning engineering · python · pytorch

L2RPN Challenge

Learning to Run a Power Network (L2RPN) is a competition run by RTE, Europe's largest grid operator. As a team at EnliteAI, we ranked 1st in the WCCI 2022 edition.

web development · rails · tailwind · stimulus


Data Job List aggregates job opennings in data science, data engineering, AI, and related fields, with focus on remote positions.


reinforcement learning · machine learning engineering · python

Power Grid Congestion Management via Topology Optimization with AlphaZero

Matthias Dorfer*, Anton R. Fuxjäger*, Kristián Kozák*, Patrick M. Blies, Marcel Wasserer
*equal contribution

RL4RealLife Workshop in the 36th Conference on Neural Information Processing Systems (NeurIPS 2022)

data-driven security · python · r

The Broken Shield: Measuring Revocation Effectiveness in the Windows Code-Signing PKI

Doowon Kim, Bum Jun Kwon, Kristian Kozak, Chris Gates, Tudor Dumitraș

27th USENIX Security Symposium (USENIX Security ’18, CORE A* conference)

WEIS 2018
data-driven security · python · r

Issued for Abuse: Measuring the Underground Trade in Code Signing Certificates

Kristian Kozak, Bum Jun Kwon, Doowon Kim, Tudor Dumitraș

17th Annual Workshop on the Economics of Information Security (WEIS 2018)

Get in touch

If you’d like to say hi, you can reach me at .

I am available for hire, but my capacity for new projects is currently limited to around 5 hours per week.