In the Qur'an or the sunnah, it does not say anywhere that working as a woman is haram. Islam treats both genders equally, however, each has different jobs. Is it not true that men have to avoid women, or at least lower their gaze? That does not mean it is prohibited for them to work. I understand where your concern is, but the consensus seems to be that the quranic verse (33:33) that says:
“And stay in your houses, and do not display yourselves like that of the times of ignorance”
means you should not go out except for that which is necessary. Work is not displaying yourself for the sake of it, no. It is to earn money, to earn a living. If Allah granted us the chance to work jobs to help our ummah, it is not haram unless the haram itself is integrated into the said job. If the job encourages haram work, then it is deemed haram. If it doesn't, I do not see a problem