Do you plannig to make "confirmed" accounts, when wo\man should meet with your worker to confirm their face and skills.
It's great offer, but i think it can be not only meet but skype and any video chatting. And they just can't check all who want to be checked, so it should be VIP accounts only able to use this function.
Perhaps it will be enough to send scans of the passport or driver's license and after checking the pictures, the account will get the status of the authenticated