[pdpi]

Also, learn Javascript and browser tech in general. One of the keys to high-performance systems is figuring out how to make the layer above and the layer below talk to each other while removing yourself from the process as much as possible.

[cudgy]

I would think that most front end developers already know JavaScript. It might make sense to look at some other approaches like Go (and maybe Rust/C/C++), which is designed for back-end work unlike JavaScript which was basically shoehorned into back-end work in order to leverage all the JavaScript developers in many companies.