They want a frontend engineer to traverse a Tree datastructure in the technical round. I didn't have any idea that this is how Userled takes inteview for frontend roles otherwise I wouldn't have bothered to move ahead with the interview. First half of the interview was React specific which they referred as "warmup" question however that was very tricky questions which was based on async, and the second half - barely got 15mins left when they brought Tree data structure problem which requires recursively mapping values. Nothing wrong in asking DS/Algo in technical round however you need to be transparent about your interview process that this is how you take FE interviews.