Hi..

If you want to hire people abroad , you have freelancer.com , guru.com , upwork.com , and elance.com . These are the famous ones mainly used by developers and graphic designers ..

If you want something bigger , without a middle man , then you need to have the over seas candidate sign a W-8 form , for your taxes to keep in record . It just shows that this person is not a U.S. Person and he is not liable to US tax payments or deductions .

The above mentioned platforms take care of the tax deductions If people are either in USA or outside.

I've managed multinational distributed teams before. I can help if you need more info.

Good Luck!