What is the ruling on working as a computer engineer in projects that include unveiled or Christian women, or teaching male and female students in mixed courses or those that include unveiled women, and what is the ruling on maintaining computers used in usurious transactions, knowing that the questioner lives in a secular country?

It is permissible to work on student or company projects, or in the catering sector, when there is a need, provided that Islamic legal guidelines are observed, such as avoiding seclusion (khalwa), handshakes, and lowering the gaze. It is also permissible to handle devices used to record usurious loan data if the person does not record them himself or assist in doing so; otherwise, it is forbidden due to Allah’s saying: "And do not cooperate in sin and aggression."