I applied online. The process took 4 weeks.

The first round of interview was behavioral and technical with a manager, and it went well. The process and the questions were highly well thought out. Then I was asked to do a take-home assignment, which is usually not my favorite thing to do. But since Whoop was one of my top choices, I spent a good amount of time on it. Although it was my first time seeing those problems, I explained every detail step by step in my code. I passed this round as well.

By this time, my assumption was that the hiring team got a sense of my problem-solving skills, how I do a project, and my signal processing skills. I used considerable high-level signal processing methods, such as filtering and others. The last round was an interview with the hiring manager to whom this role reports. I expected that this round would have some behavioral questions and some high-level signal processing questions. However, without any behavioral questions, the interviewer jumped to asking very basic technical questions, such as what an eigenvalue is.

I was so confused and disappointed. Although I answered all the questions, I could not remember some very basic stuff, which was not fair. I understand they want to make sure that the person they are hiring knows the basics, however, I think they should adjust the questions based on the person's resume. I was so confused throughout the interview because I expected more technical questions, like different filters, their differences, or their application, rather than asking what DFT and DTFT stand for and what their difference is.

Anyway, one day after, I got rejected. I don't think that I was disrespected, as all my PhD work and papers are signal processing-related. However, I think that was a waste of time for me.

What is an eigenvalue and eigenvector?