What is the ruling on working in usurious banks and their Islamic transactions branches in Egypt?

It is not permissible to work in a bank that does not adhere to the provisions of Islamic Sharia, as this constitutes cooperation in sin. This is unless a Muslim is confident that the Islamic finance branches within such banks adhere to the rulings of Islamic law, and that their investment channels are separate from the usurious bank, and are not merely a facade to attract people's money.