I interview developers and information security people all the time. I always ask lots of questions about Linux. As far as I’m concerned:
If you’re claiming to be an infosec professional and don’t know Linux you’re a fraud.
If you’re a developer and you don’t know how to deploy to Linux servers you’re useless.
So yeah: Get good with Linux. Especially permissions! Holy shit the amount of people I interview that don’t know basic Linux permissions (or even about file permissions in general) is unreal.
Like, dude: Have you just been chmod 777 everything all this time? WTF! Immediate red flag this guy cannot be trusted with anything.