The API server described in this post is actually a very very small part of the Mixpanel codebase and was the only part written in Erlang (as far as I know). Th

The API server described in this post is actually a very very small part of the Mixpanel codebase and was the only part written in Erlang (as far as I know). The Erlang server was written in the very early days of Mixpanel and worked well enough for a year and a half, mostly untouched. The statement about iteration is a bit ambiguous, because there was actually very little iteration on the Erlang server, but a ton on the rest of the (Python) product. So, the lack of iteration wasn't due to high turnover, it was due to having something that worked and other problems to solve. (I'm an intern at Mixpanel)