[SamFold]

SumUp (8B valuation) uses Elixir and I'm sure there are more.

https://www.crunchbase.com/organization/sumup https://www.sumup.com/careers/positions/berlin-germany/engin...

[hartator]

SumUp backend is built on Go. They use Elixir only for some hardware things. It seems more like a toy thing for them.

Ref: https://www.sumup.com/careers/positions/

[SamFold]

I wouldn't go as far as saying it's a "toy" for them, I know some engineers there and someone who joined recently who spent significant time learning Elixir before joining.