Kakutani Shintaro is a Ruby programmer and organizer in Japan. He works at Eiwa System Management building Ruby on Rails applications and coaching clients in agile methodologies. He is involved in the Ruby community as a board member of Nihon Ruby-no-kai and a core organizer of RubyKaigi conferences. RubyKaigi conferences bring together Ruby programmers internationally to share knowledge in a spirit of collaboration represented by the Ruby value of being "nice" to one another.