I spent 40 to 60 hours on this process easily. I was fully qualified, fully prepared, recommended by someone working there. I watched all of the videos they told me to watch, read everything they said to read, and practiced my demo in front of my old coworkers and a group of friends. I understand that there was clearly someone more qualified than myself. However, I wish I wouldn't have spent so much time refining a challenging (really endless) project. It was a great and fun demo, but not the right choice for an interview. I highly discourage applying for his position unless you have fully planned for failure and have the time to commit. It was a bit more emotional of a let down, because you put so much effort into it.