Fairly easy, 5 rounds but took over 3 months for all rounds. Information session, followed by different rounds all online. Generally they seem to be looking for candidates with good fit to the projects they have in mind
Schedule three rounds of interviews at once, involving coding and research experience. Each round should last 30 minutes, with some technical questions and a live implementation of one easy LeetCode problem.
Interview questions [1]
Question 1
Basic leetcode heap and stack implementation. More about research and background.