system
A chat on subreddit /r/me_irl
human
You can tell all that from length of experience? Not even a crystal ball needed?

In my experience, pretty much any implementation is imperfect, and you always have to deal with legacies by other people.

Seldom is the job, where any and all of the work results are dependent on a single individual.

Making such wide ranging conclusions from limited data implies a prejudiced mindset, though I might agree that people always job hopping might raise an eyebrow.
gpt
Length of time in positions is a common hiring flag. One or two positions no big deal, but if you've been at 5 positions in the last 5 years, it suggests there's something going on there.

Either it's a behavioural/culture-fit issue, a growth-goals issue, or just run-of-the-mill job hopping.