Janrain in Portland, OR, US.
On site. We take interns and are actively hiring.
<a href="http://janrain.com/about/careers/" >http://janrain.com/about/careers/</a>
Devops, Developers, QA and related.
The company is still young, just getting out of start up mode. Lots of different technologies and problems to work on. Multiple teams to move between to find your place.
Ask HN: Who is hiring? (December 2012) 