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There are very few companies developing telephone switches. Ericsson famously ditched Erlang in the late 90s, and as I hear there's very little Erlang remaining there.

Can't say about other companies.

Cisco uses Erlang in the control plane apparently [1]

[1] https://twitter.com/guieevc/status/1002494428748140544

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Ericsson absolutely still uses Erlang [1] - the vast majority, if not all, of the core Erlang/OTP team are employed by Ericsson, and that team is still very much active and constantly improving the language and runtime.

[1] https://www.ericsson.com/en/news/2018/5/erlang-celebrates-20...

Yes, I know that. They have the team and continue developing and improving Erlang because they have paying customers who use Erlang.

Inside the rest of Ericsson, however, there's very little Erlang left. Once again, only hearsay, no hard proof. They still hire for Erlang here and there (used to be primarily non-Swedish offices) [1], and they offer theses for Erlang [2]

[1] https://jobs.ericsson.com/jobs?keywords=erlang&page=1

[2] https://www.linkedin.com/jobs/view/master-thesis-erlang-json...

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