Oh wow, I never knew Klarna uses BEAM. I always thought BEAM is vastly underrated and it's even hard for me to convince clients of showing how powerful it (Elixir/BEAM) really is, especially when they're already on something like NodeJS. This will be a nice reference to use in conversations with future prospects.
One of the early investors worked for Ericsson on Erlang.
Klarna was one of the biggest Erlang shops in 2010s. Then there was some turmoil, but their main system is still in Erlang
I'm interested to see how this goes, I find it difficult to convince anyone to change from the herp-derp status quo.
To add on to your statement that the BEAM is vastly underrated, it's the only runtime that I know of that has enabled multiple small sub 50 people teams to scale to millions of daily active users.