Duolingo Software Engineer interview experience

The problems felt harder than what I expected from a screening test—one was described as a hard dynamic programming challenge and another as a hard graph problem—and they included LeetCode-style medium-hard to hard patterns. In my case, I didn’t succeed and was rejected after submitting. Another experience I had with this kind of HackerRank setup involved graph and string problems too, and the questions were still in the medium-hard range; the difficulty felt like it was testing deep fluency rather than only baseline screening. Overall, the OA difficulty and the way it ended the process