Fifth Sigma (fifthSigma dot com) do distributed database clusters. We've been working with database clusters that serve billions of database operations daily since the year 2000 at large organisations such as Amazon, Google, and Mozilla. We provide full operational services for large database clusters of HBase, MySQL, or Cassandra. As such, we are buried deeply in the OpsDev methodology of work. All infrastructure must be dealt with algorithmically when it grows to hundreds of servers, and we only deal with infrastructure of those sizes. We were doing OpsDev before the word was conceived. Contact me or visit fifthSigma dot com if you need DBA consulting help for your large database cluster.