I'm the owner of an e-learning company called frentix GmbH in Zurich, Switzerland. We develop the Open Source Learning Managment System OpenOlat and provide commercial OpenOlat services like development, hosting, support, training etc for this system.

OpenOLAT is build mostly in Java on top of the servlet API. But we use also quite a lot of JavaScript in the OpenOLAT user interface and for our mobile projects.