I interviewed with Brian back in January 2015. He asked me some dumb question about optimizing elevators. I bonked it, because I thought I was interviewing to help build his products. I was coming from Pivotal/CloudFoundry and from having spent years building a massive scale p0rn site.
Nice enough guy, but large ego and even back then didn’t know what he was doing. You can scale RoR, but why bother when there are other tools that just work. It is amazing that after all these years, they still suck at building for scale. Really sad to see.