Konstantin HaaseAs current maintainer of Sinatra, Konstantin is an Open Source developer by heart. Ruby has become his language of choice since 2005. He actively participates in the Ruby community and regularly contributes to different widespread projects, like Rubiius and Rack. In 2010, he successfully took part in the Ruby Summer Of Code, working on Rails internals. Haase is currently studying IT Systems Engineering at the Hasso Plattner Institute in Potsdam, Germany, and works part time as a software engineer at finnlabs in Berlin. Read More Read Less