Not so surprising :-)

  1. “Uber is gradually moving its marketplace development from Node.js to Go and Java”
  2. “This is the part of the system that actually has to be up so this is where we do aggressive failure testing and require the highest level of scrutiny about all the changes we make”
  3. “The map services compute the ETAs and routes for the trip. These are some of the highest throughput systems and are mostly written in Java”

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