G-Research Quantitative Researcher interview questions

A headhunter contacted me and told me about the offer. I took a test in maths, with a bit of physics and software engineering. I expected it to be more in data science and machine learning.

- written exam - triage interview (maths, finance) - three technical interviews (1 hour), I chose maths, ML and programming. - interview with research manager I felt in control in the technical interviews, then I couldn't answer one brain teaser in the first "HR interview", and that's it. I think this is not a clever way to measure someone's ability to do research.