Anywhere:
Basho (makers of Riak) are hiring all sorts of people.   See the postings here: <a href="http://www.basho.com/company_careers.php" >http://www.basho.com/company_careers.php</a>
Also not listed is the need for an ops/tools type person who can wear many hats.  If you like the term DevOps, consider it a devops position, if not, call it what you wish!
If you need to be in an office, we have offices in Cambridge, Ma and SF, otherwise you work where you want to work.