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At that scale my choice would be Java. Proven, reliable, plenty of devs, vendor support, good type system, and plenty of open source code to leverage. Plus it's it's a mature ecosystem.

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Java the language or any language that compiles to the JVM and can leverage existing Java libraries?

I'd go with Java itself. It's the most mature and stable. Uber is not a startup. It needs an enterprise solution.

Scala, Go, Python, Haskell, Erlang.

Instagram seems to be doing OK with python.

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