Tassitron Combat Engineers are Hyperion combat units encountered in the Claptastic Voyage DLC from Borderlands: The Pre-Sequel. They have been installed in Claptrap's mind by Harold Tassiter to defend the H-Source.
*In True Vault Hunter Mode, they are renamed Tassitron Battle Architect, and in Ultimate Vault Hunter Mode, they are renamed Tassitron Engagement Operative.
Tassitron Combat Engineers are essentially a reskinned Combat Engineer and attack using the same methods. They shouldn't pose too many problems for a well-equipped Vault hunter.