As a woman in IT, if your pay is less than your male counterparts, it may not be that you are less competent, and it may not even be that your employer is biased. It may be that your employer is simply paying you a market wage, which is lower for you than for your male counterparts because there are other employers who are biased against you, therefore the demand for you is less. Its about supply and demand, not necessarily bias from your specific employer. Its bias from the market as a whole. However, there is cold comfort in knowing that you are competent and more valuable than others paid the same as you.