He has been offered a job in a bank that deals in riba (interest)

I am working in a software development house. Recently I was offered by the company to go to XXX for on a one year contract. I showed my willingness to them. But after few days I was told that I will have to work for XXX Bank. I know its Haram to work for an interest based organization like a bank. Someone told me that in XXX there are some banks that do Islamic banking. I dont have much information about the bank. I have submitted some queries at some places but so far I havent received any reply.
Can you please advise me whether I should work for XXX Bank or not as most probably they would be dealing with Interest based banking and I will be helping them in their job.