Uber infrastructure broadly supports 3 kinds of workloads: stateless microservices, big data (batch) and stateful, each running on its own hardware silo. Morcor aims to reduce the cost of infrastructure through co-location of stateless and non-guaranteed batch jobs. Morcor is deployed successfully at Uber allowing us to free up hundreds of thousands of cores from stateless services and use those for running tens of thousands of batch jobs daily. In this talk, we will describe our approach to co-location, the problems we solved and what lies ahead for us.