Julien Danjou is a free software hacker almost all of the time. At his day job, he hacks on OpenStack for eNovance. And, in his free time, he hacks on free software projects like Debian, Hy, and awesome. Julien has also written The Hacker's Guide to Python and given talks on OpenStack and the Ceilometer project, among other things.
Prior to his talk at OpenStack Summit 2014 in Paris this year, we interviewed him about his current work and got some great insight into the work going on for the Ceilometer project, the open source telemetry project for OpenStack.