The Ruling on Working in a Riba Bank

Question:
The questioner says: I work in a private center, and part of my job is supporting a bank that operates on an interest-based system. I was asked to develop a banking system, along with some of my colleagues, that includes an interest component. I refused to do that part, and they asked me to work on the parts that do not involve calculating interest. Is this work halal (lawful) and free from doubt? May Allah reward you.

Answer:
The ruling is that a Muslim does not work in a bank or in riba (usury or interest) banks, because he is cooperating with them. The Shaykh 'Abd al-'Aziz (may Allah have mercy on him) said that one should not even be a doorman, because being a doorman or a guard is cooperating with the bank. Allah the Exalted says: So, stay away from these matters and seek your provision in other ways. Whoever fears Allah, no . He swears, yes. You will find one who gives you a fatwa, and one who gives you a fatwa, and one who gives you a fatwa, but look to your conscience, and look to what is between you and Allah the Mighty and Majestic, and do not look at what so-and-so said and so-and-so said and so-and-so said. Look to what clears your conscience, for people are of no benefit. If you made a mistake, yes.