PubNub  (<a href="http://www.pubnub.com" >) - San Francisco, CA
PubNub runs a globally distributed "real-time network", a cloud service that developers use to build and scale large real-time applications. We power a wide variety of large-scale real-time apps including financial trading, social apps, online auctions, multi-player games, telecom infrastructure, retail apps etc.  
PubNub is based in San Francisco with an awesome HQ in SOMA, and a low-drama, hard working team of smart people. If you like mega-scale systems and tough engineering projects, PubNub is for you.
Check out <a href="http://www.pubnub.com/jobs" > to see the list of opportunities