I had a first video interview, one 90min test on quantitative skills (math-stat-coding) and a second video interview. After these 3 they told me I did not performed good enough. Nice experience overall, fun problems to solve and nice and kind people in both interviews and in HR. I had no previous experience in interviewing for quantitative finance jobs and I have an academic background (phd+3years postdoc). I found it a bit strange that they put strong emphasis on being able to solve fast simple mathematical problems (high school level - math olympiad style) or coding simple python functions. In my experience as a researcher, this correlates poorly with being a good researcher (finding the right questions, fighting with hard problems for months, have reliable results). I felt I could have performed better in a interview like that when I was an undergraduate student. I think this approach is common in these types of interviews for quant jobs, but I don't find it very optimal