* New manager who was a nice guy but didn't help me or other folks onboard
* A skip-level (who I expected would be my direct) manager who was about as hands-off as could be and seemed interested in building his own empire.
* SDE3 who was nominally my mentor but was less than useless. I asked him to whiteboard our services, and he said he "didn't know" what we owned. I asked him for help configuring a monitor for a service, and he said he couldn't figure it out while literally backing away from my desk slowly.
* A culture within our team in which no one was willing or able to help others out. It was very much every man for himself.
I GTFO of there and have been happy across the lake since. Paying back my signing bonus was well worth the significant reduction in stress and quality of life.