They raised the pay for nursing, and suggenly it attract more males.
They increase the job flexibility for many professions, and it attracts more females.
Companies that seek out women for coding jobs do so since they feel that’s an area where they can find employees. If a male feels he has been discriminated against, he can file a complaint. Given that most people in the industry are male, it might be hard for such a complaint to be taken seriously. As computer and engineering jobs are largely male, a company needing to find employees looks for new reservoirs of potential talent on the assumption that any males interested in the job have already applied.
There are some jobs that are inherently female, such as “wet nurses” (largley obsolete since most mothers will bottle feed if they can’t nurse a baby). Most of the rest are determined by economic factors and social factors. Even among goyim, many women greatly value job flexibility in order to also work as mothers (among frum workers, everyone values flexibility in order to keep Shabbos without getting fired).
Note that within the Jewish community, the outside rules don’t apply. There is a big demand for male nurses since many frum men don’t like strange women touching their bodies. Similarly, there a demand for female doctors by many frum women who don’t want men touching them. Also note that teaching is considered a respected, honored, and sought out profession by frum men, where among the goyim it is regarded as what you do for a living if you lack the skills for anything more productive.