Working in a riba-based bank with no pay in order to learn the accounting and networking systems
Question

                I am currently learning about a computer system that uses networks, but I do not have experience. I was told that this system is used in banks. Is it permissible for me to train in a bank that deals with interest (without any salary)? Shall I look for another place to train on such technical matters, knowing that it is difficult to find one, or it is alright to do so?.
Praise be to Allah.It is not permissible to 
    work in riba-based banks, with or without a salary, because the one who 
    works in them will either be dealing directly with riba by recording or 
    witnessing it, or he will be helping with it in some way. The riba-based 
    banks are places of great evil in which a major sin is committed and there 
    is no guarantee that the one who sits in such a place will not be subjected 
    to the curse of Allaah of which He has warned those who engage in riba. 
    There is also no guarantee that the one who trains in such a place will not 
    be tempted by his self that is inclined towards evil to carry on working 
    there because of the temptation he finds there. 
Hence we say that it is not 
    permissible to work or train in riba-based banks. You should look for 
    another place that is free of sin, and you will find it in sha Allaah. 
We ask Allaah to help and 
    guide you. 
And Allaah knows best.