[zengr]

I am surprised no one has suggested https://www.upwork.com/ (formerly elance/odesk) yet. I have hired people for small work there and made professional relationships with them too. You can find good US based companies there and they do good work! Strongly recommend.

[grzm]

See this recent discussion for reasons why they might not:

https://news.ycombinator.com/item?id=12773282

There have been some very negative experiences reported here wrt upwork.