NOT A COMPANY OR A JOB BOARD, Just a relevant piece of information
To job seekers, Andy Rachleff (Benchmark), Dustin Moskovitz (Facebook/Asana), and Sheryl Sandberg (Facebook) suggest choosing a company on a breakout trajectory. [My addition: whose mission &amp; team you strongly align with. [1]]
  If you join a company, my general advice is to join a company on a breakout trajectory. There are a usually a handful of these at a time, and they are usually identifiable to a smart young person. They are a very good risk/reward tradeoff. Such a company is almost certainly going to be successful, but the rest of the world isn’t quite as convinced of it as they should be.

  - Sam Altman

[1]: Why join a breakout company? <a href="http://www.breakoutlist.com/why/" >
Ask HN: Who is hiring? (November 2014)