Kalman is a committed open source enthusiast and contributor, who writes Drupal modules since version 4.7. As a senior Drupal engineer at Pronovix, he takes part in planning, specification and module development. He is an active member of the Drupal community, maintaining Shield, Multiform and several other modules and themes, contributing core patches to Drupal 7, helping out the Drupal 8 Multilingual Initiative, and providing help and support via email, community forum, irc and Skype. He is also a member of the drupal.org and drupal.hu documentation team.