What's the point of using node.js and other backend freelance, if all customers ask stretch in the CMS where you need an understanding of php.
My "all customers" - was asked to develop a custom solution (not CMS) and absolutely not interested in what instrument I'm going to do it (I'm on the Go doing backend and Dart frontend).
again, for freelance at what level you need to know the backend?
In the low-price segment you need to know everything.
In the expensive segment - specialization is very useful.