Savas Parastatidis is a Software Engineer at Facebook. Previously he was the architect of the cloud platform behind Cortana, Microsoft's personal digital assistant. While at Microsoft, he worked as an architect and developer at various projects, from Xbox One to Big Data processing in the Cloud Computing, Stream Processing, Scientific Computing, and more. Prior to joining Microsoft, Savas was a Principal Research Associate at Newcastle University where he undertook research in the areas of distributed, service-oriented computing and e-Science. He was also the Chief Software Architect at the North-East Regional e-Science Centre where he oversaw the architecture and the application of Web Services technologies for a number of large research projects. Savas also worked as a Senior Software Engineer for Hewlett Packard where he co-lead the R&D effort for the industry's Web Service transactions service and protocol. Savas' web corner (including his blog) can be found at http://savas.me and his twitter stream http://twitter.com/savasp.