As an employer I would be negatively surprised if a candidate for FE never heard of react, angular, etc. But I also see a red flag of the candidate were to assure me to be knowing all of them bottom up. That would mean a lot of toy projects and unstable personality, if not plain lies. I'd be looking for someone able to work for some years on a code base, grasp its stack, improve the overall structure, quickly find and fix bugs in a sustainable way, etc.