Signature campaign is not a job. why you guys treat it as a job.
A real job needs a contract and that is why they called it bounties because they will reward you after the task. It's different to real job.

If you are looking for bounties the only place where you can find it is here
But they giving mostly altcoin or token, not a bitcoin.

But if your purposes of joining here are for signature campaign your rank is not eligible to join in any campaign that posted in services section board.