The team I interned for took me back full time.  When they  needed someone to focus on care and feeding for the build/test automation of our suite of web services I jumped on it.  Soon we had the idea to share our blend of tooling and approach with other teams. 

The implementation of open-source and low-cost developer tools won favor and unseated a big logo rival's all-in-one-do-nothing-good platform.

The success of the platform needed more than just one or two, soon a whole team responsible for suite of products and services under a massive platform. I left running a department of ~45 employees across 5-7 agile teams supporting hundreds of services, tens of thousands of global customers, and millions of builds and deployments occurring round the clock.