Johannes Stein has been interested in software and game development for most part of his life. He has used a variety of technologies, programming languages, and platforms.In the last few years, he has worked as a freelancer using web and mobile technologies for a number of different companies and start-ups, working on several iOS apps and games. Among the technologies he used were Sparrow, cocos2D, and UIKit. He has co-authored the book Irrlicht 1.7 Realtime 3D Engine Beginner's Guide that was published in 2011 by Packt Publishing. He can be followed on Twitter: @Stoney_FD.