Holger Bohlmann studied computer science in Hamburg. He lives in Hamburg and worked for a long time in Berlin. Since 1999 he has participanted in many agile projects as a developer. He has many experiences with eXtreme Programming (e.g. a lot of pair proramming) and Scrum.
I've seen many ways to develop software: From being an developer for a company, which developed software as service provider to working as developer/scrum master in an agile team. This includes developing classics J2EE Applications, iOS Development and web portals, so I worked on concrete projects which are mostly visible, not on technical components.