REMOTE, wherever
DataStax makes the enterprise edition of Cassandra, the NoSQL db for serious applications.  We have developers all over the world and a 100% remote working environment.  Some of the development is open source (we are the primary contributors to Cassandra core, which is an Apache Foundation project...)
I just joined recently; as a senior developer with startup experience, I had lots of offers from various companies.  The reasons I chose DataStax were:
- 100% remote means I can work from wherever I want (I like to travel) and whenever, within reason, as long as I get my stuff done
 - the opportunity to work on interesting new technology that is rapidly changing and being adopted by a lot of Fortune 100, etc
 - they have been vocal about their plans to IPO in the next few years and are growing like crazy
Very competitive salary, lots of open positions: Java, Python, JS, I've even seen some Clojure.  Also, SDET and technical writing.
<a href="http://www.datastax.com" >
<a href="http://www.datastax.com/company/careers" >
Hit me up, esmith at datastax dot com, if you'd like an intro.