I've been lucky enough to have collected feedback from at least a handful of companies. I've also interviewed with TripleByte. They didn't match me with a job but they are detailed on what I did wrong in the interview. They also said I sounded a bit nervous. I don't stutter or shake my voice so I'll have to figure out what are other signs of nervousness that I might be showing.

Most of the non-generic feedback I got on tech skills followed the same theme- I have breadth in knowledge, but not depth. I'm not as "T-shaped" as I thought I was.