You're coming at this backwards. They had 100 engineers already. They needed to design their software so that the engineers could all keep working on it. The

You're coming at this backwards. They had 100 engineers already. They needed to design their software so that the engineers could all keep working on it. They explicitly say as much: > This application has served us very well for the past four years. But as we've expanded and exponentially grown our mobile engineering team, we started seeing breakages of the architecture, we started seeing problems where feature development would become pretty hard. We had to test multiple code-paths because we shared a lot of view controllers amongst different teams. We really started to hurt with the old architecture because it was written by two engineers and we had grown the team to over one hundred, at that point. The actual quality of the software isn't as important, since Uber drivers and riders don't have a choice anyway.