A DevOps crew? Mainframes aren’t something that are just part of some random web app project in a company. A System Administration team would be the likely maintainer. But a lot of mainframes are designed to be run with very little manual maintenance these days.

They’re also wildly different architecturally from your typical rack of x86 servers, which is why the initial reaction to Linux running on a mainframe sounded stupid at first. When I worked at IBM in the 2010s, a Linux Zserver felt more like a VM running inside the mainframe than anything else. There were abstractions of the mainframe components that intentionally leaked into the Linux side that were interesting. I knew very little about traditional mainframe software development at the time, so I was very fascinated by how it all worked.