Bart is a Principal Software Development Engineer working on large-scale stream processing systems in the Applications and Services Division at Microsoft Corporation, a course and book author, and a popular speaker at various international conferences. In his current role at Microsoft, he’s overseeing the architecture, design, and implementation of event processing systems that run at massive scale in data centers, as well as on cloud-connected devices. One of the publicly visible technologies powered by this infrastructure is Cortana. Prior to joining the Applications and Services Division, Bart was involved with the design and implementation of Reactive Extensions for .NET (Rx) and on an extended “LINQ to Anything” mission back in the SQL organization.