I work as a Systems Architect and Open Source Evangelist at ImmobilienScout24, the leading German real estate market place. Core areas of interest are open source solutions and web operations.
The ImmobilienScout24 web platform is based on Linux, Apache, Tomcat and open standards. Most of the infrastructure automation is Open Source and can be found at http://github.com/ImmobilienScout24 and at http://yadt-project.org.
Most of my coding is in Bash and Python, my biggest Open Source project "Relax and Recover" is written entirely in Bash (https://github.com/rear/rear).