The most obvious answer to effective testing is to make sure each unit test is performed correctly. In the landscape of enterprise systems compromised of cloud providers, z/OS, and many middleware, integration, and development programs, it becomes a complex web that can seem impossible to connect and test all together. There is an answer, and that involves understanding applications, what areas could easily have integration tests stitched together, and how to implement testing as a service within your organisation. This session will cover the technical details to understand more about application integration testing, how Galasa, an open-source project, could be implemented at scale and worked examples of integration testing to help make it easier to scale testing at your organisation.