Referred via existing employee; the overall process took about a month and consisted of a phone screen, email test and final in-person interview with a variety of individuals over the course of 3 separate meetings in one morning.
Both the phone screen and email test went flawlessly; meeting the group of individuals conducting the interview is where things immediately fell apart. I was initially left and forgotten for almost a full 30 minutes in an empty conference room, as apparently, the first interviewer forgot I was there that day. This misstep resulted in a series of quick and uncomfortable sessions (because the initial interviewer burned most of their interview time which resulted in everyone else each arriving while the previous interview section was still ongoing) of 8 different people asking a battery of questions from cultural fit/personality to technical aptitude.
While the cultural fit/personality test went ok, as that interviewer was the most experienced of the bunch; every other portion of the interview seemed unfocused and irrelevant to the job I was interviewing. Even the manager interview I was subjected too felt strange and almost nonchalant; as if nobody (including the management) cared to be there. The technical test was significant alone for how very strange and unrelated to the subject matter I would be employed for which only contributed to the disjointed, wacky feel of the whole event. In fact, the technical test involved a single interviewer who appeared to have a general dislike of people due to their abrasive demeanor.
To top off the three-ring circus the in-person interview turned out to be, I was promised a phone call by the end of the week and never heard back from them until I received an automated survey from Tableau's career portal when they closed out my initial application. I later learned from the employee who referred me they ended up going with a different candidate and couldn't be bothered to contact me to let me know.
Overall, I would say unless you're desperate or are applying for a more significant position within the company (except perhaps management), other employers are available in Austin that won't waste your time, forget why they are interviewing you in the first place and treat you with such a degree of disrespect that Tableau seems to have a knack for.