Nokia

Quick phone screen and an online coding test. Then, a general technical interview with a few easy HR-type questions about interests, previous projects, working in a team, and motivation, etc.

A 7-round, in-person interview. It was the most grueling and felt pointless because of how repetitive it was. Both system design and LeetCode-style questions were asked. Most interviewers were friendly, but I did not think it was worth going through

This was a 3-hour whiteboard session. It was heavily focused on the technical side only. Questions were a mix of classic software engineering and applying principles in their use case.