VocalFi
VocalFi was a telecommunication service that offered web-based conference services. Much of the application was built by young contractors using the Cake PHP MVC framework.
I was later hired as a short-term contractor to make the application cacheable via MemCache. This entailed a lot of code abstraction and heavy cleanup to reduce the incredible amount of code duplication. Once that was done, we were able to easily add meaningful caching.