But what's the most important thing in finance IT business is to keep with business knowledge. Having only pure IT skills will get you nowhere. You need to understand a business side of your finance domain which means being able to easily communicate with your clients/customers in their language. It's pretty common to see IT guys in finance having Series 7/24/63 or CFA certificates on their resume (I'm one of them).
Again if you want to be in finance IT business for a long haul, focusing on general IT knowledge only is not enough.