Meta Research Scientist Intern interview questions

I applied one of reserach scientist internship at Meta, but it did not move forward at first time. But after a few months, HR told me to have an interview for that position. It was something weird. I took two interviews, one is for research background, and the other for live coding test. Research background interview went well in my opinion, but I could not complete the coding even though I explained all detailed algorithm for given problem. The interviewer always ask me a time complexity for the algorithms.

two 45 min technical interviews regarding research and general knowledge related to their projects. One interviewer was in my field and the other was not so had to do some background search of what their research interest is to be prepared of what types of questions they would ask