Very nice people. Had typical JS questions, React, JSON, patterns. You had to know more about UI design which at the end of the day is more than just coding. Experience and changing perspective to the user's experience is just as important.

Mostly the interviewers were super-friendly and extremely relaxed. Also the manager people I talked to were really professional and relaxed. It seemed like a good company to work at. Downsides were the heavy math questions, if you thought Google interviews were tough, think again! Then there were IQ puzzles, and writing code on a chartboard 10 hours long with different interviewers. A few of them seemed a bit too nerdy and too cocky for my taste. By the time they asked me to iterate in 4 lines through a matrix I knew I blew it. Another downside was, that half of the people I was scheduled to talk with, did not show up and they made me wait 1,5 hours for my first interview. Overall a good impression of a firm that sells wiretapping software to Iran to infiltrate Iranian Twitter and Facebook Users. Sorry had to be said.