Well, that depends what part of your career that you’re looking to have them bolster.
In the book Goetia Pathworking, Corwin Hargrove suggests that Forneus is a Goetic demon that you can work with to gain fame and reputation in a specific area or “art.” It may also be helpful to use Forneus for this specific career path, as Corwin also suggests that power and fear can be other perks of working with this spirit.
I’ll also link the Unofficial Tutorials Directory for support on actually contacting the spirit.