Roku Senior Software Engineer interview questions

I was approached by an external headhunter, who knew the VP of HR over there. Eventually had a 1-1 with the internal recruiter, went pretty well. Then I had an initial phone screen with a SW Director there. He was very technically oriented; we talked about how I'd go about troubleshooting a wonky wifi connection. He seemed very impressed. Had the F2F interview. Things did not go so well. They asked me questions about TCP, how to bring up Linux in a new embedded system, pthreads, etc. I was flailing so badly, I could hear the sighs of exasperation from the Director that phone screened me, and the SWE attack weenie they sent my way. The guy finally came out and told me I wasn't what they hoped for (a bit smugly I found). I concurred, and was sent about my merry way. However, they did alienate me to the point I returned the Roku I bought from them to try out. It's interesting, but nothing I haven't seen before (just in a smaller package). To me, they're just a one-trick pony within a low-margin consumer market. So if you want to go, go cause you'd like to work on their tech (which seems interesting), but bring your A-game. Anything less, and you're mud to them.