Short process, one or two rounds on phone and then onsite for a whole day. The interviewers were very nice. Basically just some math, coding questions, nothing very different from other firms.

Few hr calls prior, First round: Questions on regularizations, gradient descent, probability brain teasers, calculus, linear algebra and prob ineq. Final Onsite: 3 rounds in total, Leetcode coding problems, questions on higher math concepts, linear regression, rapid fire brain teaser problems, and my previous ml background.