This is exactly what spam is. It's what the term was created for.
It has been posted many times in the US chatroom and it has now seeped into the England chatroom, much to my visible annoyance. I've looked around and seen it in the chatrooms for countries like Wales, Swaziland and a dozen others.
It's spam because nobody comes to GKO for a job. As infuriating as it is to see the chat spammed with 'players for sell' across a hundred countries (even if you have the filter turned on), or even to receive personal messages from people 'looking for players with xLA', those messages are at least relevant to GKO.
This job posting is not relevant to GKO. It is definite spam. Spam, spam, spam. So much spam there's no space for the baked beans!
We've needed chatroom moderation for ages, but this is the first time I've ever seen job advertising on it. Consider it the straw that broke the camel's back.