Person reporting a bug often will not be having knowledge of the source code, right? So the best he/she can do is to assign the bug against a particular component. Will it help you if you can subscribe to a particular component rather than getting notified of all bugs?
1. Get ready to be flooded by a bunch of low-quality, copy/paste proposals on the freelancer. Ignore them, and focus on finding the diamonds in the dust.
2. The more specific your proposal is, the better informed your designer will be and the more likely you’ll attract a quality designer (who, naturally, want quality clients). Gursimran commented that I was one of the best clients she ever worked with, and she is certainly the best designer I’ve ever worked with, which is sincere praise even with a sample size of 1.
3. English is funny sometimes. Examples you can point to sometimes help a lot more than our limited design vocabulary, especially when you’re an engineer and your design vocabulary contains only the words "pretty" and "not pretty".
4. For God’s sake, look at the portfolio before accepting a bid. You might not get designs as stunning as the portfolio, but you certainly aren’t going to get better, and about 50% of portfolios disqualify designers straightaway.