What is a junior developer exactly?

What do junior developers do, and do you need to become one first?
 What do juniors do? Can you skip a junior stage and just become a developer? We’re discussing this with the members of the Scrimba community at different places in their careers.

 In this Fireside chat, we’re trying to define the role of a junior developer. How do you know that you are ready for it? What should a junior developer expect to do at work, and what should they never do? What decides on seniority in a company, and why do some job postings stipulate several years of experience for a junior role? Spoiler alert: there are two possible reasons for that, and one of them is more benign than you might think. The other one, however…