The interview process is in 3 stages. A basic interview, a week-long take-home test, and then an on-site interview. The take-home test was an open-ended test that allowed for many different approaches. I suspect that the particular methods and the presentation of one's answers is as important as the answers themselves.

There was an initial call. After that, HR sent a problem set. It took about 6 hours to complete 3 problems. Then they gave a tedious reject email without any feedback. Worse, they state that they refuse to provide any feedback or discussion in the email. Generally speaking, if you don't want to waste your time or make yourself upset, then don't take the interview.