Span is a London developer conference that focused on building scalable systems, featuring talks from developers and industry experts covering topics such as reactive programming, unified logs, and distributed data stores. The conference was sponsored by Couchbase, which sees scalability as its primary driver in all aspects of its development, including its shared-nothing architecture and Database Change Protocol. A video of the conference's talks will be available online soon, with plans already underway for a second edition, Span 2015.