You have more chance to find people who know less than you than real professional.
I have use different free lancer but last was a real scam. Just hurt website down to 60% and do not stop it even after my request. The worst is that they do not even answer dispute.
*******@freelancer.com
Senior Account Manager keep silence on dispute... keep going to destroy the site until he can pick up money even when you ask them to stop their acticitiy.