Alarm.com Embedded Firmware Engineer interview questions

I applied online and had a phone screen, then a grueling 8 hour long interview. Each person I spoke to took an hour, lunch was a couple of young people who cared a little too much about their own colleges. I even spoke to Jean-Paul, which meant I had passed the other screeners, but in the end, I think they weren't actually interviewing me for the right position. They wanted an embedded Linux programmer that was good with GUI, and I am a pure embedded guy good with sensors, buses, low-power and everything else but GUIs. They told me that they would get back to me within 48 hours, but it took over 2 weeks, and eventually they declined without explanation.