I went through a round of applying for jobs on HN (based on the first-of-the-month posting), and the most common reaction from the company is no reaction at all.

I have this nagging suspicion[1] that many job postings are not done to find developers but just as a form of soft advertising to get the name out in the community.

[1] I'm heavily biased to find this true, even if it isn't, so be skeptical.