Ask HN: What are your red flags in job listings?

I was recently scouted with a pretty good offer from a company and they looked good on paper. But their app had 1.4-1.5 ratings on yelp and tripadvisor with walls of text from people with bad experiences. Their glassdoor was 4.5 but filled with ridiculous amount of 3-word 5 star reviews. That was pretty shady and I declined.

The experience made me curious, what are your (not so obvious) red flags when job hunting?