Staffer

[Tanya Shivari]

someone who is a member of the group of people who work for an organization:

[Vania]

an employee who works for an organization, especially in politics or the media :

[Jason Yan]

[Albeit] an older definition, a [staffer] is a person who works for a company, group, organization, etc. So basically an older way of calling yourself an [employee].