I imagine their personalities would be just as diverse as Earth housecats. Some would be thoughtful, but others would be impulsive. They tend not to trust, but they will be loyal to those who have earned their trust.
As for career, that all depends on their current circumstances. If they have been abandoned, they may turn feral, and piracy would be their only means of survival. Those who have grouped together into tribes, or even formed villages somewhere, their careers would depend on their skills. They would require hunters/fishers, weavers, medics, carpenters, stonemasons, architects, traders, police, a defence force, diplomats, and everything else a successful village would need.
As for the nomadic spacefaring cats, they would require medics, shipwrights, and everything else a ship could ever possibly need.