Question: I applied for a job and during the various stages of the job interview the hiring person told me that they will get back to me in a certain amount of time. However, after every round of the interview the hiring person overstepped that limit. One week turned into two, two weeks turned into five. **And this happened after every single interview round.**

Even though the job sounds interesting and is with a reputable company, I wonder how they will treat me on the actual job if if they overstep their maximum allotted time to respond to me after every single interview round.

The position I'm applying for is relatively new in the company, so I think they're taking their time with the job applicants, but still, overstepping the time limit to get back to me on three separate occasions is non-professional to say the least. They also didn't acknowledge the delay.

**Should I consider this kind of behavior a red flag?**

Answer: 
I would take it as a potential red flag regarding deadlines and accountability as they relate to corporate culture. I would definitely be frustrated being part of an organization with that in its culture.

That said, there are legit reasons for delays. A realistic possibility that comes to mind is you didn't make the cut between rounds but a higher ranked person dropped out.

The best thing you can do is ask to the reasoning at the time of offering/next interview round. I would just phrase it, "Is this a normal part of the company culture or were you experiencing exceptional circumstances?"
I would say that unless you apply for a job, the quality of their HR is not that important. Look for red flags with the people you are working with, they are more important. You can get an excellent job in a company with rubbish HR.