Interview process is moderate. My interviewer was nice and mostly questioned about the API integration and slack workspaces. Was asked about split screen feature in slack and how its coded.
Submit resume to your major department - interview with major professor - get offers or chance to be Phd student they ask.
It is not difficult interview process. It is just process to become a graduate student or Phd student.
It wasn't too long, but it was around the 30 minute mark, so I liked it. I didn't have too much trouble with it, but I heard some people had really hard questions.