yes - I am aware that you support Python, etc. .. but nodejs is your first class language. For example, even your docs only mention nodejs (and java recently) [1]
what is even more interesting is that you felt it worked nicely for expressing event handlers. Can you talk a bit more about that - very interesting to see why not something like python or ruby. I know that nodejs is a callback-oriented framework... was it the fact that you can test locally on nodejs consistently versus what would be the expected output on Lambda ?
[1] https://aws.amazon.com/lambda/faqs/