Yo (kind of:) There's the usual finance / banking guys. But also a lot of ERPs - the corporate bread and butter hr, Financials, crm, erm, scm, etc applications

Yo (kind of:) There's the usual finance / banking guys. But also a lot of ERPs - the corporate bread and butter hr, Financials, crm, erm, scm, etc applications (I'm in this space, historically as sysadmin / light developer, then perf testing, infra architect, tech team lead, now as kind of a ops manager). Over my 25 years and few dozen projects, mainframe was a significant portion of implementations and almost always at least on the table as potential platform. Fwiw, What I always find fascinating though is that after many an implementation on "distributed platform", I. E. Unix Linux or Windows, as soon as any performance issue arises, there's a lot of calls to "move it back to mainframe" . I don't agree with that myself necessarily, but A lot of big enterprise shops feel that mainframe is an expensive pain, but reliable predictable well-performing expensive pain.