Just FYI, you don't get career rewards for reaching the top of a career. A career reward is given on a certain job promotion. So if you cheat and go straight to the top, you will miss out on it.
This is also a problem with one or two uni careers (forgot which ones), if your Sim has the relevant major and gets the job through the computer, s/he will start the job at a level past the point where the career reward would be given. Obviously not an issue with harderjobs, or applying through the newspaper.
Uni fixed that already, you will receive your career award even with advanced starts. This lets you kinda scum them without harderjobs by just applying to everything on the computer.