Almost everything, all at once.
My current job is running IT (literally all of it except for a couple of special situations that are managed by specific other people, like the inventory database server being handled by the accounting manager).
In addition to some software development work (both for production systems we ship out, and internal stuff), this includes, among other things:
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.