also: システムオペレータ
noun
system operator; sysop
A person responsible for running and maintaining a computer system or online service, especially in BBS or early internet contexts.
その掲示板のシステムオペレーターは、毎日ログをチェックしている。
The sysop of that bulletin board checks the logs every day.
I contacted the system operator and had them resolve the account issue.