How Do You Define Unfair Bias in AI?

Fairness can be measured at group levels or at the individual level. Do you wish to ensure that on average you don't discriminate against a protected group or apply the protection to each and every individual? For example, you may hire female job applicants with the same average probability that you hire male applicants. That would achieve group fairness. However, you may be biased by giving junior roles with higher probability to females and senior jobs with higher probability to males. Achieving individual fairness is more difficult than achieving group fairness.