Konstantin Haase is an open source developer, book author, and former opera star.
Ruby has become his language of choice since 2005. He has maintained and made significant contributions to many widespread Ruby projects, including Sinatra, Rubinius, Rack, Rails and Ruby itself. In 2012, Konstantin received the Ruby Hero Award for his outstanding contributions to the community.
He is a co-founder and currently the CTO of Travis CI, the market leader in hosted CI solutions.