To be a PIC on a Citationjet (I assume you are talking the CE525) you are going to need a type rating. Assuming you get a single pilot type, you are going to have difficulty finding anyone to insure you with your flight time, unless your boss is willing to pay around 60k a year for insurance. Even then, most places are hesitant to insure CJ pilots single pilot post 9/11unless you have time in type along with various other qualifiers. If you are hired SIC, you won't be able to log the time unless the PIC has a crew type. Good luck.