Konstantin Gredeskoul is an expert technical leader, serial startup CTO and a Co-Founder, and an avid open-source contributor. He authored over forty Ruby Gems (35M+ downloads), often speaks at conferences (250K+ presentation views), and contributes to several high visibility open source projects such as bash-it and bashmatic. Konstantin has a passion for building well-oiled engineering teams from diverse backgrounds that harness the incredible power of pair-programming, TDD, collaborative software designs, infrastructure automation, and continuous deployment. Besides being a technical guru, Konstantin has a strong creative side: being a DJ, producer, and, most recently, — a drummer. Over the years he released two albums available on iTunes as PolyGroovers. He DJs under the stage name XeroFox, which you can find on SoundCloud. He writes a personal/technical blog at https://kig.re/