If you saw any blue badge employees with a yellow/red/purple border around their badge, then that signifies how long they've been at the company.
Saying someone is a yellow badge badge is saying that they are a full time employee with 5-9 years of tenure, most SDEs don't work with contractors so we don't talk about yellow badge contractors all that often.
If you're interested in this sort of thing, the color is actually supposed to be orange, but the color came out yellow.
Honestly, I never ran into many blue badges down in logistics. Mostly all white and yellow badges, with a few exceptions... and most of the time I was in and out so fast I wouldn't have noticed any colored border on their badge. The only time I would've interacted with a blue badge is if there was a problem on-route.
TL;DR DSP drivers don't encounter many blue badges.
Saying someone is a yellow badge badge is saying that they are a full time employee with 5-9 years of tenure, most SDEs don't work with contractors so we don't talk about yellow badge contractors all that often.
If you're interested in this sort of thing, the color is actually supposed to be orange, but the color came out yellow.