In the premiere he is referred to as "the new engineer" and indeed in Disco's second season the Enterprise's chief engineer was someone named Louvier. Though not seen, the dialogue implies Louvier had been serving on the Enterprise for a while, at the very least, Louvier was said to be very familiar with Pike's distaste for the holographic communicators.
Yeah, and we only see him beam onboard at the end of episode 1, otherwise he's entirely absent, but certainly no-one has haze-fooled Hemmer into wearing a dress uniform...
But you're right, it does seem as though Hemmer is familiar to Pike and Spock already. Maybe he previously served on the Enterprise, but not as chief engineer?
I need to watch the scene again i think.
Edit -
Watching again, there's absolutely nothing to say Pike is familiar with him in the scene as they don't interact and Spock describes him as 'our new Chief Engineer'.
It seems clear that Hemmer and Spock have taken a liking to each other, which is natural given both of their personality types, plus the fact they are both 'outsiders' within the crew... but nothing to say he's been there a while. My bad.
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