They are a big company that operates with a fairly proprietary set of programming language and tools (see: https://en.wikipedia.org/wiki/MUMPS), and they hire a good number of people right out of undergraduate degrees. I remember there being a large proportion of non-CS students from across the country there interviewing for engineering positions.

What they're looking for, I think, is not necessarily your ability to "hack" and program, but that you fit the mold of someone they can put through a rigorous 6 week (or more? I forget) training program that will teach you the basics of their stack, and then have you banging away.