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Back in 1989 that was a rare skill. Many of the engineers who had experience were working on government projects. I mean TCP barely had congestion control at that point, it was very early days.

"Usually we don't hire people from high school, but you had Common Lisp in your CV, so the engineers said to take you anyway." 2010, still simpler times.

Same for me in 2006 as a junior Linux sysadmin:

“What does ifconfig do? What does it mean to mount a disk? What editor do you use? You’re hired.”

None of that culture fit nonsense.

Did you say vim or emacs? Might have been culture for afterall.

I forget. I used to use emacs but very superficially; when I started the job a literal greybeard UNIX admin shook his head and took me under his wing to teach me vim, which I used for a long time before switching back to emacs (and learning the elisp underpinnings of it)

Do you know DNS? How does an HTTPs/SSL handshake work? Man this kid is good hire him. - 2015 era job interview

Have you finished 3 months Javascript bootcamp ? you're hired - 2019 era.