From Diablo Wiki
Kaivax is a Blizzard CM who began work around the beginning of March, 2011. Along with Bashiok, he is one of two Blizzard employees who posts on the official battle.net forums. He has not yet received his "blue" avatar.
While every CM shares responsibility across all the various products that Blizzard creates, Kaivax is only one of two that can be spotted on the Diablo III forums.
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