Tableau Software Solution Architect interview questions

I interviewed twice for a Solution Architect role that paid up to $145-160k total comp ($105-120k base, plus ~10-15% bonus, plus restricted stock units that would vest over four years) with up to 80% travel required. (This is what HR told me in the first interview.) I share this info in the interest of transparency so that others going for the same role may know what compensation range to expect. Both interviews appeared to go very well and I was promised two deeply technical interviews plus a complex demo I would be asked to deliver. (They said they were hiring two of these roles every month to keep up with growth.) An offer seemed assured were these subsequent interviews and my demo to also go well. During my first phone interview I was asked to spend a couple hours getting to know the software and build an example dashboard which I shared with the interviewers although HR failed to hand it off to the next interviewer as I thought they would—after I gave him the dashboard, the second interviewer remarked that he was impressed given I had no background in their particular product but had obviously started to pick it up quickly. The disappointing aspect of the process was that I was an internally referred candidate, and therefore a candidate to treat a bit better; and uniquely well-qualified and well-known from a competitor. However the HR department dropped the ball several times on following up with me. My internal contact had to remind HR twice to contact me after they failed to respond to my follow-ups on more than one occasion. So—After being congratulated and assured more interviews, they dropped the ball again, never following up and not responding to my email wondering about scheduling those promised next two interviews. My internal contact was exasperated and reported the situation to their HR VP. My contact's complaint finally yielded a lackluster HR apology and response asking if I wanted to continue interviewing. I declined at this point, as it seemed they were insincere from the get-go. Perhaps they had second thoughts about my candidacy but they were not forthright about it. The experience left me with a bad taste in my mouth about the organization. It's probably better once you get through the front door but be wary of a recruitment process than might string you along.