Align Technology Sr Software Engineer interview questions

The process seemed quite easy. A company recruiter reached out to me. We did a brief p[hone interview which led to a phone interview with a Software Team Manager.

First of all, there was a phone interview with an HR manager. It was more about common qualifications, career pursuits and so on. Then there was a phone interview with a team leader containing a couple of C++ oriented questions and several 3D-math ones. During the onsite interview, there were supposed to be people from various teams, so I could find a better fit, but it all came down to one team (the one from the phone interview), a couple of easy programming questions and some kind of a linear algebra and calculus exam. At last, the hiring manager came in, we've chatted a little bit, and I went home. I wasn't really satisfied with the interview process (didn't like the phone interview quality and math exam at the coding interview) and the environments of the company, therefore I rejected the offer.