Jesse "JerAx" Vainikka is a Finnish professional Dota 2 player currently playing for OG.
JerAx made his name in Heroes of Newerth, where he played for a number of teams including "Dirty Minds" (with Era and SingSing) and "Man the fuck Up"/"KD-Gaming" (with Era). He then did a compulsory military service in the Finnish navy, and when he had finished it, started playing Dota 2.
On the 15th January 2018, JerAx unveiled his own merchandise website JerAx.GG.
JerAx began his Dota 2 career in the Finnish team Rat in the dark as a support player. After playing with them for a month he was approached by SingSing, and JerAx joined his team, QPAD Red Pandas as a trialist. A while later he was announced as a full member of the team.