The latest issue of Jump magazine in Japan has explaubed that the jobs in Bravely Default: Flying Fairy are tied to various crystals. The earliest crystals you find include crystals for theMonk, Black Mage, and White Mage job classes. Changing jobs in the game will cause your character’s battle style and clothing to change along with giving you access to some special abilities. There will also be enemies that have jobs. These types of enemies are known as ‘Job Masters’ and defeating them will allow your character to obtain a new job.
You can check after the break for a scan from the game.