Kevin the CTO of Mattermark here. A lot of people have had good success using our product to find cool companies to work at. I'm also happy to help you out with application / interview tips. Email me if you want a hand kevin@mattermark.com
Mattermark went through YC recently with Kevin as CTO.
Then I went to Mattermark and read about it a bit... could be useful. Maybe a bit excessive to get more than the free trial for a job search, but, for investing, it could be useful.