[ncmncm]

Curiosity is a quality, but not a qualification.

For hiring, what you should look for, first and foremost, is competence. Curiosity is not a substitute.

[nicoburns]

Curiosity is a decent indicator one of the many types of competence that you ought to be assessing: the ability to learn new skills and deal with problems that are outside of their current skill set. Which for most software jobs is rather key skill.