Is it permissible for an engineer to work for a company that designs general computer programs, if these programs will be used by usurious banks, knowing that he stipulated he would not deal directly with these banks and that other colleagues would install the programs for them?
The ruling on designing software depends on the predominant use of such software. If its predominant use is in interest-based transactions, then it is not permissible to design it. Otherwise, the default ruling is permissibility.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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