Sex is a federally protected class[1]. Discrimination in employment decisions based on any federally protected class is illegal, and can carry rather large fines.
Using a job board that explicitly discriminates based on a protected class is a very, very risky idea. If a member of the untargeted portion of the class (a male) sees a job ad there and is denied employment they have very good evidence for a sex discrimination lawsuit.
The next time I (male) am looking for a job, I will make a specific point of seeking out job advertisements targeted at women in tech and applying, just to see what happens.
Unfortunately, the Department of Justice chooses to not enforce this law when the offending objective is to hire anything but white males. It should be enforced equally.
Using a job board that explicitly discriminates based on a protected class is a very, very risky idea. If a member of the untargeted portion of the class (a male) sees a job ad there and is denied employment they have very good evidence for a sex discrimination lawsuit.
[1] https://content.next.westlaw.com/Document/Ibb0a38daef0511e28...