Ask HN: What serverside programming language would you use in your next startup?

depends on what you want to do and which languages you already know.

node

Here's the three answers you will get when try looking deeply for it:

1) Quick prototyping old-school: Ruby with Rails or Python with Django

2) Asynchronous Single Page App: Node.js using either something like Meteor (fullstack) or combining something like Express(backend) with Angular/Ember

3) You already have big clients, you need 'scaling' immediately: Java or Scala with one of their frameworks.

Assuming there is a next startup and it's anything like the current startup, then I'd probably go with Groovy again. Groovy has worked very well for us.