It might be a better sell if you try to introduce Elixir, and I am guessing its Phoenix library/framework as well.
I've tinkered a bit with Golang and I love it but IMO it's too much extra work in the Web development part. It's exciting and very educational to pop the hood and understand how many things fit together, especially if you're coming from Rails, but you should be aware that after a while the novelty wears off and sooner or later you'll start looking for the quicker paths to introduce trivial Web cruft.
I am yet to experiment with Elixir + Phoenix but the community feedback so far has been fantastic.
I've tinkered a bit with Golang and I love it but IMO it's too much extra work in the Web development part. It's exciting and very educational to pop the hood and understand how many things fit together, especially if you're coming from Rails, but you should be aware that after a while the novelty wears off and sooner or later you'll start looking for the quicker paths to introduce trivial Web cruft.
I am yet to experiment with Elixir + Phoenix but the community feedback so far has been fantastic.