My red flags from one of the worst companies i have ever worked for...
1-they have a status Quo
2-when you propose ideas they shut you down because you are too new to propose ideas
3-they are arrogant and think their experience means they are never wrong
4-they yell
5-they don't listen to understand but listen to debate you and tell you are wrong
6-high turnover rate
7-you see good reviews in Google maps from current status quo members and is about praising the members not the company
8-glassdoor reviews are anonymous and very scary

After 4 months i was totally demotivated and after 1 year i left for a much much much better place. Thank God