Very Difficult to understand coding puzzles not found on Leetcode or any other Algo & DS site. Interviewers were nice and professional. Still questions were very difficult for any Sr developer, including them, to answer during an interview. These interviews have the same Big-Tech pattern of a high filtration process that kicks out a lot of good candidates for the certainty of hiring the right one. Honestly, unless you have all the free time in the world, its a low low hit ratio and a crap shoot. Better off spending your interviewing efforts elsewhere.