The Hyperion Engineer looks somewhat similar to the Combat Engineer in that they wear yellow hazmat like gear but they differ greatly in their mode of combat. Hyperion Engineers wear an upper body exoskeleton that allows them to lift things much heavier than they could normally. Rather than use weapons, they prefer to get in close with the extended arms of this exoskeleton and attack with big swipes and stabs.
Like the Combat Engineers, these enemies tend to be far softer than most enemies in their level, making them good fodder for a Second Wind. It is important to be careful around them however because they are still capable of doing large amounts of damage.