I applied via their website. One of their recruiters responded within a couple of days.

Next was a 60-minute online multiple-choice quiz covering the basics of C++, C#, and SQL. It had 14 questions, and these could easily be answered in a small fraction of the total time given. I had plenty of time to double- and triple-check my work.

Then was a phone interview with their recruiter. He asked about some things on my resume and asked me some more technical questions centering on data structures and algorithms. He wasn't a developer himself, but it seemed like their developers had provided these questions.

Then followed two more phone interviews, each with a different developer on their staff. These were done with a live collabedit.com session where they asked me to develop various algorithms live while on the phone with them.

Write a function implementing the _________ data structure (various kinds including Stack and Binary Tree).

Now rewrite your work without using loops (e.g., recursively).