Bank Jobs and Riba

My topic today is inspired by a juicy bank job offer I had to reject. I was asleep in the morning when my phone rang. So I was reluctant in picking it up but when I checked, it was a name that hardly calls or not at all. So, I just had to answer. I answered and the caller asked me to take my C.V to her office and go for an aptitude test with her bank. As a senior official, she is entitled to "spots" for her candidates. With my degree in Accounting and an MBA and searching desperately for a job, I was her first choice. I was to get a management position and receive a huge salary and benefits. Juuuuiiiicy, right? Well, I declined.
I know I can only afford basics, most times going for the cheapest commodities to be able to do so but I still rejected. Why?