Roman gained most of his experience during years spent in Yandex where he was in charge of designing and building from scratch highly loaded online data processing systems, cloud storages, data transport systems, consensus protocols, as well as full products like automatic bidding and PPC fraud prevention systems. Of course at some point he wasn’t able to hold all responsibilities himself and eventually he grew a team around the products he built which have grown into multiple teams. Currently he works for booking.com where his team’s mission is to scale machine learning usage company wide.