Doing continuous delivery by itself is hard enough, but what about doing at large scale? We know that everything gets harder at scale. Doing continuous delivery with a single or a few services is pretty straightforward, but what about when you have dozens or hundreds of teams releasing hundreds of services and components into production? How can DevOps work at scale? How does culture, team structure, architecture, and tool chain enable or hinder this? John, Director of Engineering Productivity, will share lessons learned at Ancestry.com on scaling continuous delivery.