First round is a recorded online interview on "taketheinterview.com". You are asked 5/6 questions and have 30-90s to answer each. Questions are about what AlphaSights does, why you want to work there, and your past experiences.
You cannot retake and even rewatch your answers. If you are still talking when time runs out, they just cut you off and move on to the next question. So be sure you can fit everything you need to say in the allotted amount of time.