Sysadmin
Noun · Slang & Abbreviations
Definitions
System Administrator — the person responsible for maintaining and operating computer servers and networks. The title has been evolving toward 'DevOps engineer' and 'SRE,' but sysadmins still exist everywhere things need to actually work.
In plain English: The person who keeps the servers and networks running — the unsung hero who makes sure everything works and gets called at 3 AM when it doesn't.