Kudos to the marketing team for the name of the "in-house" built proxy:
"We will be back with more technical details regarding the problems we faced, the optimizations we applied and the lessons we learned from building Pingora and rolling it out to power a significant portion of the Internet. We will also be back with our plan to open source it.
Pingora is our latest attempt at rewriting our system, but it won’t be our last. It is also only one of the building blocks in the re-architecting of our systems."