Coming from C64 and Amiga I am now a multiplatform/platform independend developer on Unix/Linux and Windows mostly in Java, C++ and SQL as well as HTML/CSS/JavaScript with special knowledge on performance improvement, code improvement etc.
Also I am specialised in the area of calendrical calulations.
Special knownledge is also available in the area of logistics and the anoto digipen.
Also I am working with hardware like Arduino and Raspberry PI and know on which end a soldering iron would heat up ;-)