Google

A three-hour online phone screen. Questions were pretty basic, something along the lines of elements in a list (finding pairs that sum up to a given number). I had a competitive offer, so the process was streamlined for me.

The interview was challenging, with heavy emphasis on data structures and algorithms, along with in-depth questions covering core computer science concepts, problem-solving skills, and theoretical understanding throughout the entire process.

A few interviews got rescheduled and it took a few months to complete, but people were helpful and interviewers overall were nice, just a bit exhausting to get rescheduled that often.