"I am an employer."

Translation: Eu sunt un angajator.

[prince_lazar]

Why is "un" not needed?

[Rarevorove]

because when it's about something that you are, "un" becomes optional

[mascha53]

Why not ”o angajatoare”?

[JonEnMiljon]

My two cents is that it's because employer/employee are not professions but only tell about your state on the labour market, and so they don't need to have gender specific alternatives. But this is only a guess.