FFXIV: Stormblood has added all-new items to the Mog Station, one of which allows you to level boost a single job to level 60. Along with that, you get a full set of ilvl 260 gear, and more.
Below is a video where I level boosted my 30 Machinist to 60. Check it out:
The level boost costs $25 and is available on the Mog Station. Note that it is not available for the two new jobs: Red Mage and Samurai.