It's a weird job, has pretty much no pay, and the benefits are just a way to make him work forever. But to tell the truth, Jace couldn't have a better one. Getting approached by a god was weird, and awkward, (he may have accidentally called her a fraud), but he only thought for a moment before accepting her offer. "Guide those I send to this world from another." He just thought, "Woah, that's a job?!" He didn't care why he was a good fit, why they were being incarnated, and now, he's having the ride of his life (and it's one hell of a roller coaster)!