> The second bullet in particular can be ironic because I've seen senior-engineer-written code break production because it tried to rely on a third party librar

> The second bullet in particular can be ironic because I've seen senior-engineer-written code break production because it tried to rely on a third party library to do something without doing any unit, functional, or performance testing to ensure it was doing the right thing and doing it fast enough. Seems like they were "senior" only in title.