I made the same mistake but I believe you can tell because the verb is würde instead of würden.
Also because it uses "Wer" instead of "Wen", meaning "Who" is the subject of the sentence, not the object being hired.
Thanks J, I was really wondering how to know which one it was. I will probably still make the same mistake, but now I know that there is a difference that would be logical when used to it. Now I just have to remember everytime I do it wrong again in the future :-P
Because Wer uses the same conjugation of the 3th singular person er würde,and würden is the conjugation of the first And 3th plural person as well the formal you with capital S
Wir würden=we would Sie würden=you would sie würden=they would