In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
We apologise for the delay in responding to your query.
Islam teaches us that a woman who wishes to adorn herself may do so, but her adornment must remain within the guidelines of Shari’ah.
It is permissible for you to become a “Nail Technician” for both Muslims non – Muslims. Nonetheless, caution should be observed that no Haram components should be found in the materials used.
Please note, also, that it is disliked to cut nails during periods of impurity[i].
And Allah Ta’āla Knows Best,
Mufti Saeed Ahmed Golaub.
Islamicsolutions.org
[i] حلق الشعر حالة الجنابة مكروه وكذا قص الأظافير كذا في الغرائب ( الفتاوى الهندية 5:358)