Hi, author here. With respect, I am a mid-career senior engineer too. I trained for a few weeks before interviewing at Facebook because, well, changing jobs is

Hi, author here. With respect, I am a mid-career senior engineer too. I trained for a few weeks before interviewing at Facebook because, well, changing jobs is important. There is zero harm spending some time warming up mentally. I recommend that people prepare because I've seen many many obviously smart people not make it through. It's like showing up for a singing audition without warming up your voice. You might have a beautiful voice, but you have to show it in the best condition possible.