My main language is Go. I like to do a bit of everything, so often end up working on React front-ends, Go back-ends, or Ansible and Terraform for maintaining an OpenShift cluster. In the past I have set up TeamCity and Jenkins, getting pipelines deploying code to virtual machines, or Docker containers, or OpenShift environmnents.
I have a background working with C#, F#, and all the .Net stuff, but I can't say I massively miss it these days.
I'm also interested in functional languages, and have been doing a lot of messing about with Clojurescript using Re-frame for creating front-ends in my own time.