The Wikimedia Foundation is the non-profit that hosts Wikipedia and other free knowledge and open data projects. These projects are made possible by a global community who, together with the Foundation, comprise the “Wikimedia movement”. The Wikimedia movement is united by a vision: to bring about a world in which every single human being can freely share in the sum of all knowledge. We talked with Timo Tijhof, Principal Engineer at the Wikimedia Foundation, to find out how the organization approaches security and performance at scale.