We're hiring at Ning, more or less all roles: front and back end engineering, operations, product mgmt, UX, QA, various management roles. On the eng side we have java, ruby (not rails (okay, there is one rails app)), c, php, and whatever-or-not, the focus is on getting the job done with the right tool for the job not the language or framework.

http://about.ning.com/jobs.php

Email me if I can answer any questions -- my HN username @ning.com