[overgard]

I only had one experience with this early in my career, but I remember it wasn't good. Basically, we had a 5-6 person team that had to support like 10 important legacy services. One person essentially ended up being on call for a week, having to wake up early to debug issues with a thing you didn't build in the first place and only vaguely understood.

Do you think this company had good CI/CD and automated tests? They did not. There was fortunately a lot of monitoring so at least you knew when the service was in a bad state, but absolutely nothing else other than a ticket and an angry customer.

I would much rather have extensive test coverage, very good CI/CD, make sure not to do releases on weekends and holidays, and have a few people whose job is to do the monitoring and escalate to the right people rather than just putting a target on a random engineer's back and hope they can fix things quickly.