A working partnership could be the perfect job situation for Aquarius. You relate best to others on an intellectual level, and a relationship that omits all the messy emotional stuff seems ideal!
Note, however, that nobody completely leaves their emotional being at home (not even you). You still have to make a business partner feel valued, appreciated, and equal.
In the best of all worlds, each of you would have a realm of responsibility - say, you're the creative genius and your partner is the nuts-and-bolts half that brings those ideas to fruition. It's a match made in heaven!