The plista Contest is an ongoing search for the best performing live recommender algorithm. The company's network outputs 2.5 billion pieces of feedback information about user behavior per month. That is a lot of data that needs to be processed, and an endless opportunity for developers of algorithms. This workshop offers a peek behind the contest technology, which uses Enterprise Service Bus (ESB) and Software-as-a-Service (SaaS) technology. Developers will be faced to streaming algorithms to handle realtime data. This also covers data denormalization and live evaluation of the team recommenders and of course, questions on data privacy will also be a topic.