I wouldn't call myself an "expert" in any particular thing. I know quite a bit about a few things, and a fair bit about a bunch of things. The trick is knowing that, and to always be driven to learn more.
Currently I'm a Senior Software Engineer at Basho Technologies. We develop Riak, the most powerful open-source, distributed database you'll ever put into production.
While I learn erlang and our core I'm focussed on our client libraries; I'm currently the owner of the Java Riak Client and contributor to others.