My "official" title with my company is Network Engineer III (which is above II and I). My practical title is "Senior Systems Janitor" - but the government wonk who ran our department some time ago didn't like it when he saw that "personalized" signature. Catch is, I'd been using it for at least 18 years at the time.
Senior System Janitors - clean up computer messes. Which pretty much sums up what I do on a daily basis, including cleaning up after programmers who ought to know better than to leave their home directories in a mess.
I also have to be "Local Jaybird" - pecking at people who neglect their duties.
I am also "Big Brother" - as in ... "is watching you." I peruse the security logs on my big systems.
You might recognize this as a combination "Systems administrator" and "Security administrator." But I'm a U.S. Government contractor, which adds one more title - "Whipping boy."
For us, the rules are simple.
#1 - The contractor is always wrong.
#2 - When in doubt, see rule 1.