Three years ago Netflix migrated all of its source code to Git for version control. This change furthered the independence of our engineering teams enabling them to manage, build, test and deploy with little friction. But the more distributed our source code becomes, the harder it can be to assess the impact of a change or understand the state of the world. Making a simple change to a shared library could have impact to dozens of critical services so the more feedback engineers can gain, the better. But how do you run an expensive operation against every single git repository within your organization?

In this talk, Mike McGarr (Engineering Manager, Developer Productivity) will share the story of a service built to test code changes across all potentially impacted Git repositories at Netflix. We will also share our approach to scaling up Atlassian Bitbucket to handle the significant demands of this service.