It is very common that nowadays a huge lot of products have a middleware written in node. Writing this node code second time in my career, I would like to say, "why it should belong to a front end developer!"
Front end developers, mostly have not handled the asynchronous behavior(apart from browser engine puts a wait OR for a server call).
What would a backend developer who has coded node think?
It is also profitable to the company as they are enhancing the knowledge of the right person/team through which their UI also improves.
That was a short write. Thanks for reading! Happy coding :)