The hardest interview was behavioral. Most interviewees fail at that stage so prepare well. The questions are all standard and expected. JS interview was about a basic lodash like functionality implementation. React interview was about implementing a search functionality but the crux was about performance algo optimization via data appropriate structures. Both interviewers asked about time space complexity and both requested second attempt at improving your basic solution if not in code since little time will be left but in words. The deep dive was about picking some project from the past that you know good and diving deep into technical and architectural aspects testing your general understanding of how things work together.