I keep finding myself on both the sides of this question
"I have money but no time, how do i find some bright college student to work on this small project for me?"
"I need 400€, How do i find a small project i can develop for and have no expectation of follow up or commitment"
I find hard to trust elance, upwrok and similar as it's either super-developer-guy or random-indian-guy, middle ways are buried behind the two extremes.
On the other side of the fence, as a programmer on those websites it takes a lot of time to build up reputation and network and it's easier to just get a job at McDonalds or similar (e.g. make a website and let someone else maintain it) for those 400€.
Something like university/hackerspace/open source facebook group with a barrier of entry to keep the quality but nothing as formal as a website
That Indian (or Pakistani, or Croatian, or Thai) person could be just the partner you need. At least look at their work.
And a lot of time they charge less because their cost of living is much lower. You can actually pay them more than others would and still save on a "super" developer.
I think it would be equal time and less energy than going to a University Hackathon for hours and waiting to see who rubs you the right way.