So I do agree with you, in some contexts some backend languages are very relevant.
Personally I started learning PHP because I had to build forms to send emails and later I needed to make changes to Wordpress templates.
But this creates a problem as I actually don’t understand how PHP works at its core. I would fail interview questions and I have no desire to deep dive into the language. I might be able to do the job but since I don’t understand a fundamental programming concept I might be deemed not qualified for the role.
Also I like UI engineer as a title!
Tech deep dives are off the table for me. I only do conversational style interviews. I try to feel them out as much as possible but if I get in an interview and it slips into deep-dive I just say "I don't know" to everything to end it ASAP.
Tech deep dives are a really bad sign. At the least you are being treated as a commodity.
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