Where to begin... My interview process was as such:
1) Phone interview: Typical behavioural phone interview
2) Excel test: Your focus shouldn't be on excel proficiency (pivot tables and vlookups are all you need). Rather it's about your strategic thinking in regards to the multiple choice/short answer questions. I found this to be the difference maker... Try to understand their business model.
3) Video Interview: Honestly, I think your success in this round will depend very heavily on whether your interviewer is interested... Probably something you will intuitively know almost immediately. It's a behavioural interview + some operational/situational questions (see below).
4) 2 Phone interviews: More simple behavioural interviews where you meet a new recruiter... yes really - you meet a new team half way.
5) Take home assignment: Complete nightmare. The team generates a "case study" that has evidently been patched together in 5 minutes with virtually no information, and open ended questions that have no genuine relevance to either your fit as a candidate or your ability. Prepare to spend the next week trying to cover every piece of imaginable detail you could conceive in an effort to hopefully address any potential question they may have and to be able to convey the sense that you do in fact understand their business.
6) In person group interview + case presentation: In group interview is just going over situational based behavioural questions, team seems genuinely interested and engaged. The case presentation is undoubtedly designed to test your character more than your mind. The panel will blatantly not pay attention to you or your content, and ask ambiguous questions they know cannot be answered. Ultimately, the team seems nice but uninterested before you even start.
The process is quite involved and engaging in the sense you get some tangible examples of what they do in a day to day. Yes - the recruitment team is condescending and does not respect your time (multiple reschedules, no status updates, sparse/no responses). Does the process need to be this long? Certainly not. Is it worth it? Honestly - in terms of transferable "interviewing" skills, nothing was done that was novel. Just a long winded process, where I questioned the mutual benefits for both Uber and myself. Ultimately, after my 2 months interviewing with team and final in person interview, I was informed via 2 minute phone call that "the team went with a better candidate", despite being told I had not made any mistakes. Guess it wasn't a good fit.