node.js golang composite architecture for web application

I am currently architecting a web app that will use node.js for basic routing. Some parts of the app are more processor intensive and I wanted to use golang for those parts. However, I'm not sure the best way to install and communicate between the two languages. I'm using Amazon Elastic Beanstalk for initial tests, so any specifics can be targeted for that platform.

In essence it boils down to the following 2 questions:

1) How do you install both node.js and a golang docker image on Amazon EC2? Amazon has guides for one or the other, but not both.

2) What is the best way to offload processor intensive tasks from node.js to a golang codebase (I could imaging RPC, or just running golang on some localhost port, but I'm new to this type of thing)? The golang tasks might be things like serious number crunching or complex graph searches.

Thanks for any guidance.