Only went through the initial interview stage. The interview itself went well, respectful, interviewers were engaged, but I decided not to continue due to my personal circumstances at the time

Great process. Really appreciated both the contents of the technical challenge and the way they allow candidates to present what they've put together at the final interview: It's not always obvious why a candidate has made a technical choice or a compromise, and it can be frustrating to have a knowing compromise be mistaken for insufficient engineering ability.