WANdisco (http://www.wandisco.com/) is solving challenging problems in distributed computing over the wide area network. Our custom implementation of paxos provides distributed coordination and high availability active/active solutions for SVN, Git and HDFS.
The big data team works on our Non-Stop Hadoop product that eliminates the single point of failure in HDFS and allows HDFS to work over WAN.
We are looking for engineers with a strong understanding of concurrency and experience with distributed systems.
If you are interested, contact me at firstname.lastname@example.org