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Re:Ask HN: Who regrets choosing Elixir? by ksec on Sunday May 24, 2020 @04:50PM (#23294574)
>IIRC, Whatsapp backend used to be on Erlang

Used to be? I know WhatsApp switched from FreeBSD to Linux and swapped hundreds bare metal servers to thousands of VMs. I dont think WhatsApp ever swapped / rewrote their system in another language under Facebook.

Re:Ask HN: Who regrets choosing Elixir? by thijsvandien on Sunday May 24, 2020 @06:28PM (#23295451)
There was some confusion about that a little while ago: https://news.ycombinator.com/item?id=21111662