A. It is not permissible to work for these institutions because most of the financial products they sell contain the element of Ribaa (interest). Insurance also has a Ribaa factor in it. The Ahaadeeth prohibit participation in Ribaa on every level. (Abu Dawood V3 P249)
Allah Ta'aala knows best.
Moulana Yusuf Laher
Checked and approved by: Mufti Siraj Desai