At my organization we don't have any junior devs, we're all leads and they bring in H1B contractors that are less than or equal to junior devs in EXP but far cheaper, we use them for a bit until we complain loud enough, and then management ends their contract.

I like the contractors as people but not as coworkers. It's always mixed feelings when they go, part relief and part sorrow.

Occasionally we do get a good one and we beg for them to hire them but our Talent Strategies department (i.e. HR eyeroll) won't sponsor them.