"Not Enough Clarity about your Role" - Like the author mentions, this can definitely signify that the role is not important. The other thing I've noticed over my career is that it could be that the role involves "grunge" work (awful oncall shifts, doing backend work when you want to do only frontend, etc). Companies hide behind cool titles/department names/etc, promising whatever you want to hear to get you in.
If taking a call at 1am is your version of hell, make sure to interrogate what the on-call schedule looks like. If you're up till 3am most nights anyway and honestly don't mind taking the call at 1am, spend the limited reverse-interview time during your interview to ask about other aspects of role and company culture. (Pick your poison from the Joel Test - https://www.joelonsoftware.com/2000/08/09/the-joel-test-12-s... )