The article talks about moving away from a serverless architecture due to the cost of API gateway.

I wonder if the fact that application load balancer can now invoke lambda functions could've made serverless viable. https://aws.amazon.com/about-aws/whats-new/2018/11/alb-can-n...

Mind you, the post was written in August 2018 and the above announcement was made in December 2018.

Yep, Elixir is great.

And it's fairly trivial to set up autoscaling distributed Elixir on Google's Kubernetes offering.