I'm Jan. I help create maintainable software systems that are easy to reason about. I've researched fast in-memory column-oriented databases, have written speedy real-time bidders, and gave Apple's geocoder room for future growth.
I currently work at Apple.
Until 2012 I ran Azumo, a bootstrapped online advertising startup. We started serving banner ads in 2009 through a 100-line PHP script hooked up to MySQL. After 3 years we had a fleet of auto-scaled EC2 instances real-time bidding on tens of millions of requests per day through highly optimized C++ code.
At the Hasso Plattner Institute I researched main-memory column-oriented databases for a project that later became SAP HANA. While in college I also messed around with a number of side projects like Muxfind, Flickrgrab, Ligageschichte, and a couple of others. I worked on turning a very large set of internet forums into a cool social network. We were building one of the most scalable Django sites in the world.
Throughout Middle- and High School I designed websites, developed PHP scripts, and abused MySQL servers.