The worst is when it isn't engineers or any kind of technical leader performing any screening, but strictly an HR rep with no technical knowledge or experience

The worst is when it isn't engineers or any kind of technical leader performing any screening, but strictly an HR rep with no technical knowledge or experience outside of names of things (and the tools they personally employ) or an applicant tracking system that will immediately filter you out if your resume doesn't contain ~XX% of the required skills— or enough/too many years of experience according to the parameters in the posting. And to so many people operating that way it just seems practical. I feel lucky with how I got my current job— even though it's a very large company and they definitely do operate in those fashions, my resume somehow made it directly into the hands of the Senior Manager and Lead Engineer for the specific team at the time. They brought me in to talk— no whiteboards, no brain teasers— just some technical questions and personal/professional questions and I was hired inside of two weeks— onboarded a month later. Applying and [if I even get to] interviewing at most other places previous has left me feeling much the same as yourself...