That depends on how you define junior. Some people define that as less than certain years of experience on a resume. Some people define it in technical terms, in scope of particular competencies, or terms of interview performance.
Since there is no uniform definition of competence my personal definition is anybody who does this job but either advocates fear of writing original code or who cannot write any code without a superficial abstraction (jQuery, React, Angular) is a junior regardless of years of experience. I also know there are a lot of people who disagree with that definition.
In this particular example, I'm referring to exclusively with individuals with no industry experience and no degree from an accredited program (e.g., ABET). Some people with minimal (but some) industry experience are still called junior.
Since there is no uniform definition of competence my personal definition is anybody who does this job but either advocates fear of writing original code or who cannot write any code without a superficial abstraction (jQuery, React, Angular) is a junior regardless of years of experience. I also know there are a lot of people who disagree with that definition.