Personally, for infrastructure level stuff like that and if I was starting from scratch, I would chose Haskell.

At the scale of Uber and given that there would be a lot of legacy hanging around, I would probably chose to build on top of the kind of scala libraries that twitter has been putting out (which it sounds like from the other article about uber's micro services currently on HN they are doing).

The serious statement behind my slightly tongue in cheek remark earlier, was that I don't think either python or node are suitable for building infrastructure type applications that will form the backbone of a constelation of SOA type applications. Round the edges, it's slightly more defensible. However for central infrastructure, I'd rather have rather more foot-bullet barriers than those offer.