In retrospect, there were a ton of red flags in the hiring process.
First, the interviewers were completely disorganized. I don't think any of them had actually looked at my resume, and they certainly didn't coordinate at all. Two of them asked me basically the same question, and one was literally the same question that I had done in the phone screen.
Once you're hired, basically you go into a queue and when you start you're put on whatever team has "dibs" on the next people. There's no attempt to match people to their skills or interests. I got on a team that I had no experience for, and they were unwilling to accept a ramp up time, so I was in trouble from day 1 for not being able to contribute fast enough. I tried to get switched to another team and there was no way to do that.
If you're on a backend team, you're expected to be available 24/7. The site breaks all the time, so you're literally always working. No mercy if you have any kind of social life outside of work.