Is there any criterion by which a ui/ux designer can be distinguished? Junior/Middle/Senior?

Question

Design

1) Opening and reading vacancies is not the case. Maybe a junior position and a huge list of requirements. Or it could be exactly the opposite.
Or a kilometer of text of requirements is written in a vacancy, in incomprehensible words and formulations. Although all this can be described briefly and humanly, for "practitioners" and not theorists "
2) the quality of work is also not quite an indicator. If conditionally a beginner spends a week without getting out on one site, he will do the work at the level of a "well done".
3) a portfolio is also not a particularly objective indicator. For a person can simply upload 2-3 good projects to show what he "can do". And he is not interested in uploading the rest of the work, why bother to arrange them? And the viewer will think that the designer is a sucker who has no publications.

So where is the indicator of quality and qualification?

Answer 1

The main criterion for Junior/Middle/Senior is when you pass an interview for Junior/Middle/Senior and receive a salary comparable to the salary of Junior/Middle/Senior in the market.
Everything else depends on specific vacancies. And the fact that the employer establishes and checks himself by viewing a resume, portfolio, and a trial period.