I was called my Hiring Manager and Engineer on the team. Asked me questions on different kind of sensor's used in the product and question was: "How are you going to validate the sesnor" Questions asked: How will you test accelerometer? How will you validate Optical sensor? How will you validate Hall effect sensor? How will you validate PIR sensor? How will you validate color sensor? They were less interested in my experience. More interested in knowing the answers to the current sensors I am working on. They also asked a question on Amazon Principle. I suggest please review it before the interview with examples of your accomplishments.