Six basic jobs are available at the start of the game. One is chosen by the player when their character is created; this choice will decide what equipment the character starts with (e.g. mages may get a spell scroll; melees may get an extra piece of armor). After attaining level 30 in a basic job, 14 advanced jobs become available for the player to obtain, each requiring a quest to be completed first.
Players can change their job at any time by returning to their Mog House or speaking with a Nomad Moogle. These are found in major cities and minor cities, respectively. Players do not have a separate player level and job level. They become whatever level their job level is as each job is leveled independently.
A unique part of the job system is the "Support Job". This system allows players to augment their character with abilities, traits, and spells from another chosen job at half the level of their current job. For instance a level 20 Warrior could set Ninja as their support job. This allows them to use all Ninja abilities, traits, and spells up to that of a level 10 Ninja while still primarily being a level 20 Warrior. The support job system has no restrictions as to what may be set and allows for many job combinations.