Numbers such as employee turnover and average tenure are stats that every hiring manager should have on hand. Employee turnover is costly and can significantly damage an organization's reputation. For these reasons, turnover is an important metric that every hiring manager should be ready to discuss.

If you ask about employee tenure, and the interviewer does not have a clear answer, this is a red flag. Any company with low turnover will be proud to tell you so. Beware if you don't hear the interviewer proudly say, 'We haven't lost an employee in (X) months!'

Another way to find out about employee tenure is to go to LinkedIn and search for employees of the company but select 'Past Employees' in your search criteria. If you see a long list of people who have remained with the company for a short time (under one year is a good benchmark), then you may want to re-think jumping on board.