There was an initial call with HR, then with the Hiring Manager, and after which was a panel interview, this would have a presentation about the changeling problem you faced and how did you solve it. This is a 40 mins presentation,

Standard procedure of a few interviews before a panel interview (HR, manager(s), coding, panel) except that there was no homogeneity in the difficulty of the interviews. I haven't had an experience thus far where there was such a discrepancy between the first few interviews and the final round, to the extent that it makes me wonder what Lucid has in mind when its technical interviews go from quite basic in one stage to suddenly much more difficult. I'd think you'd look to have a more consistent effort in testing a potential applicant *before* offering them a final interview, but alas I'm not a recruiter nor am I a hiring manager. Didn't seem to me as though all the engineers involved in the whole process were under mutual understanding of my level of experience (recent college grad) and what I was expected to bring to the table, and thus what kind of questions to prepare before the interviews.