One good spot that comes to mind is when you implement "Backend For Frontend" style APIs for your clients in a microservices environment. Assuming you have a si

One good spot that comes to mind is when you implement "Backend For Frontend" style APIs for your clients in a microservices environment. Assuming you have a single page app in JS, you can have the front-end team own their specific API implementation and have them work in the language they know best. There's often also the possibility to reuse some code between the two. Apart from that, I'm a JS hater, so I would personally always avoid Node - I neither like the language nor the server-side model, I don't think either one scales well, and there are better solutions out there for the server side (besides the JVM and .NET based stuff in the other comments, I like BEAM-based things like Elixir these days).