From what I understand it describes how Viki as a platform is run. It starts of with saying that Viki uses standardized semi pre-made platforms which are maintained by someone else. Which leaves Viki engineering staff enough time to take care of the more specific and user-customed software changes.
Then it describes how new Viki services are tested within the same platform. The CI here seems to refer to the ability of that relatively standardized third-party platform to be more elastic, in order for the Viki staff to test and incorporate new custom-made services for their users (us).
And then they go deeper into programming. I stopped reading there.