ValSky, I am still not very clear what you mean by 'contracted'. I think everyone will assume that you are not providing your translations as gifts. Inevitably, then, you will be providing them under some kind of contract. Does 'contracted translator at the firm' add anything at all to 'translator at the firm'?Is it correct to say in English "Contracted Translator"?
I want to say that I was working at that company under contract.