Talk to them, and get informational interviews with hiring managers. This is an opportunity to learn what/how they are doing, if it's related to your field. And to make some connections.

At the least, connect with them on linkedin. Those will come very handy when you're actually looking.

[me: I run http://InterviewKickstart.com in NorCal. It's very common to be heavily recruited by first-party tech firms over here, both big and small]