Juniors should avoid adopting the gatekeeping behavior a lot of seniors adopt. No developer should think themself superior just because they work for a large tech company, write in a certain language, use a particular framework, went to a certain school, or any of another umpteen things.
Related to this are dogmatic behaviors like one line absolutist comments on code reviews without justification (like “Never return null”) or believing in one right tool for a given job (“I’d only use Spring to write web services and anyone who does something else is an idiot”).
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