[risyachka]

Almost no one. And you don't need an interview for that. As you said, it requires a few years of continuous focus. And most jobs won't give you that. So it's even more time.

And if a person with 5 years of experience sais he is an expert in a,b,c,d,e you don't need an interview do understand that this person doesn't even know what it takes to be an expert in one of these, because he obviously can't evaluate his skillset properly.

Nowadays you need very little to qualify to be "expert" or "senior".Sure there are exceptions, but in most cases, all you need is be able to use the technology. In most cases, people don't even understand how it works under the hood.

Just like with full-stack developers. Most of those whom I have seen know some front-end, some back end, and very basic database knowledge. And considering that in these cases both front-end and back-end are written in js mostly, "full-stack" here is a huge overstretch.

[archived22]

As lot of businesses do not reach that scale where architectural or design or quality issues may pop up, "full-stack" devs keep moving the wheel. I think that is good enough and good enough is OK.