[2] He played for team Natus Vincere (Na'Vi) for most of his career in CS:GO until entering free agency in February 2021.

He liked the game, so he kept playing it and developing as a player and some time later he found himself a team and took part in his first LAN tournaments.

This led him to a lot of victories while playing CS:S. Despite having been offered a spot from a number of top European teams, GuardiaN switched back to CS and started playing for such squads as IQFIGHTERS, DEFEATERS, Corecell, and SGC as well as for his national team, Slovakia.

After a 4-year long tenure with Natus Vincere, he left the organization in August 2017 to join FaZe Clan as the AWPer, taking over from Aleksi "allu" Jalli.

During March 2020, GuardiaN was a stand-in for Dignitas at Flashpoint for Håkon "Hallzerk" Fjærli, due to visa issues.