Stefan Kaltenbrunner is a "major contributor" to the PostgreSQL opensource project working on the projects server and software infrastructure as well as the website.
Aside from his duties as part of the sysadmin team, he is also doing regular benchmarking and regression testing of PostgreSQL and related tools. During paid daytime, he is a the Team Lead for Engineering and Consulting at conova communications GmbH in Salzburg/Austria, an IT consulting and service company providing services through its own datacenter.