js has come a long way but i'm skeptical that it's maturing fast enough for this to be the right medium- to long-term language/platform choice for something that's meant to be more infrastructure than just web app. and while php[0] is long past the hype cycle, it's more proven in this role than js, but even that is usually superceded, or at least augmented, by more "industrial" languages when approaching amazon's scale. for instance even mid-market WMS systems are often written in compiled languages like C# because of the need for speed and robustness.
[0]: nowadays i prefer ruby/rails, which can also get you pretty far before needing extra help.
Isn't this project mostly about interfaces for businesses to connect their guts? The language used to implement services behind common interfaces shouldn't matter all that much. It's just the reference implementation in js, no?
[0]: nowadays i prefer ruby/rails, which can also get you pretty far before needing extra help.