Friendly call with HR, then immediately thrown a project where the expectations were confusing and not entirely front end (it was latent algos, and not actually looking to see UI implementation). The project was far too challenging for the time given and demanded more time than they expected.
It was also rather disappointing they didn't focus on personal/culture fit on relevant team first - HR subtly collected key hiring metrics etc, and then thrown to be evaluated on engineering ability. I don't recommend interviewing at this company.
Just because the company has some unicorn status with some massive valuation, doesn't mean they will treat you well. Interview process revealed exactly this.