Barrie Kersbergen (1975, Gorinchem, the Netherlands) is a Lead Developer at bol.com since 2010. His expertise lies in big data and algorithms and is part of the team that builds software which provides personalized content to optimize customer experience using scalable technology. Barrie’s working experiences are also drawn from his years prior to bol.com, when he was a software developer at the Freudenthal Institute for science and mathematics education. At this institute, he worked from 1999 to 2010 where he has been programming educational software. Furthermore, Barrie has built and maintained High Availability clusters for running large assessment frameworks.