I'm @martinvalasek on Twitter.

Search for "valdo" in Drupal core

Drupal 8 contributions / patches
#2022549: Regression: No interface translation in the first installer steps
#2017859: Permissions export configuration and import configuration are used in config.routing.yml but not implemented
#2017019: Configuration export action path is broken when Drupal is installed in a subfolder
#1998056: Automatically update interface translations using cron
#1998696: Use Symfony Request for core includes
#2026871: Available translation updates page doesn't warn user if Update Manager module is disabled

Offline contributions
I was co-organizer of the first Slovak DrupalCamp in February 2010
I was co-organizer of the second Slovak DrupalCamp in October 2011
I attended DrupalCamp Prague 2009
I attended DrupalCamp Vienna 2009
I attended Drupal Dev Days Dublin 2013
I attended Drupal Dev Days Szeged 2014