Initial HR phone screen followed by two rounds of technical interviews over the phone before being flown on-site for a day-long technical panel interview and presentation. The phone interviews were relatively simple, touching on basic first principles and discussing prior experience. However, the on-site interview was incredibly difficult, which was not helped by a surprisingly cold hiring team. Ultimately, I was informed about halfway through the day by an HR representative that my on-site interview was being cut short because the team was dissatisfied with my performance in on-site technical interviews and design challenges.