Sims 3-biology job?

Hello,
I'm having a little trouble with my sims 3 mobile.My job is currently a genetic resequencer and my pay is $240 per day. I just wanna how how do i get to a higher position or is that the highest bio job already cause i asked my boss(anya) to give me another raise and she denied it without giving me any skill to improve and a small minus sign comes out on her head. Can someone tell me please cause i want to get to the highest career and i need to know how to get another raise. thanks in advance ^^