The interview was pretty average (in difficulty terms), but most of the people I met with created a hostile environment - very much putting you to the test, rather than treating you as an equal. The phone interview, where you record yourself answering some preset questions was intense, but a very clever use of technology to pre-screen. The on-site interview consisted of a presentation followed by 1:1 meetings. In addition, they also did a technical interview, styled after software engineering tech interviews, with mostly basic CS and basic ML questions. Overall, the whole on-site day felt like an examination, rather than an interview.