The interview process began with a conversation and resume drop at a career fair, though I was told that applying online would have yielded the same result. A couple of weeks later, I received an email asking for availabilities within a two-week window.

The first interview lasted about 1 hour and 15 minutes. The interviewer was very friendly and passionate about his work. It was a phone interview with live coding on code.stypi.com. The questions were straightforward. After a quick introduction, we went straight into the first question topic, power sets. After that question, an alternate solution involving binary strings was provided. The remaining 30 minutes or so were devoted to Q&A. I heard back in 15 minutes regarding the next round.

The second interview was also a little over 1 hour. Most of the time was devoted to a single coding question (it was up to me to break it into parts). The key idea was to break an abstract concept into codable elements, show my thinking process, and create a usable interface. I heard back the following week, but without an offer.

Both interviewers were very friendly and did a good job of maintaining a moderate-to-high level of difficulty, occasionally commenting "are you sure?", "um", or "okay" to hint at whether or not I was going in the right direction. The first interview was moderate, and the second was quite difficult. Both questions were interesting and unique, as far as I could tell.

Write a function to create a power set (as a list of lists) from a set (as a list). I wrote the code in OCaml, although I was told that any language would suffice.

Given a 0-9 numerical keypad and three chess pieces (pawn, knight, queen), write a function in any language such that Input(piece, location) returns the Output: the number of possible phone numbers. The code must compile and run.