There has been a thread to discuss the Stack Overflow Developer Survey on this forum every year since 2018, so here’s one for 2021 
The survey is now open, and at least this year they have Elixir and Erlang as options for technology questions.
Blog post: The 2021 Developer Survey is now open! - Stack Overflow
Survey: https://stackoverflow.az1.qualtrics.com/jfe/form/SV_7arimtzVFf8ipfM
