I interviewed with them at their office in downtown Philadelphia. The office was nice and had kind of a start upy feel to it, with open working spaces and no cubicles. I interviewed with the VP of Software Engineering and a Developer in a room with a white board. First, they briefly asked me about some of the experiences on my resume. Additionally, they asked me to talk about a personal project that I had worked on and how I could improve it (I explained the source code for it as well). After that we got down to business,I was to debug a problem with their webapp, I literally had to solve it on their computer right then and there I used the Chrome inspector to figure it out. I was asked to explain what some mystery function did, it turned out that it was just a function that deletes a specified amount of a character string. I was given hints throughout the process.