Ask HN: How do you define a junior developer?

For a web development position that requires basic knowledge of HTML, CSS, JavaScript companies can easily find junior developers, people with little to none experience in programming. But for system programming, how can you define a junior? Is it a person with experience as a programmer in other languages (say Ruby) but little to none experience in the language of the offer (say C++)? Or can someone without any programming experience at all find a job as a C++, Scala, Swift, Go developer?