She must not spend even a single moment alone with a non-Maḥram man.
There must not be any potential for mischief (Maẓinna-e-Fitnaĥ) whilst she is there or whilst entering and exiting the building.
If all five conditions are fulfilled, then there is no harm, but if (even) a single condition is not fulfilled then it is Ḥarām (for her to work etc.). (Fatāwā Razawiyyaĥ, vol. 22, pp. 248)
These are times of ignorance and audaciousness, and fulfilling the aforementioned five conditions these days is extremely difficult. Nowadays, مَـعَـاذَ الـلّٰـه عَزَّوَجَلَّ, men and women work together in offices etc. and it is almost impossible for them to avoid unveiling, looking at each other and interacting informally with one another. Hence women should work staying within their homes instead of offices and other people’s homes etc.
Question: Is it permissible to employ a ‘maid’?
Answer: Yes, but only if the aforementioned five conditions are fulfilled. If she does not observe veil then it will become extremely difficult for the men of your house to avoid misusing their eyes and committing sins that will lead them to Hell. In fact, مَـعَـاذَ الـلّٰـه عَزَّوَجَلَّ, she will also ruin the characters of the veil-observing women in your house. It is Ḥarām for a woman and non-Maḥram man to be alone together for even a short time and it is almost impossible for men to avoid this in their homes. Therefore, it is safer to avoid employing a maid.
Question: Is it permissible to be an air hostess?