Over the last decade, I’ve founded multiple companies, interviewed over 500 candidates, and hired more than 100 people.

As the CEO of two companies, I’ve made every hiring mistake you can imagine — and learned how costly they are.

The truth is, many bad hires look great on paper. But in the interview, there are three subtle behaviors that almost always predict trouble. Job seekers should know them, because to hiring managers, they’re giant red flags.

If someone shows up even a minute late to an interview, it raises questions right away. Sure, emergencies happen. But most of the time, it signals poor planning.

When someone doesn’t protect time for the interview, I have to assume they won’t protect time for clients, deadlines, or teammates once they’re in the role. In fast-moving agency environments, that can create real problems.