5.Boston Consulting: Recognized as one of the most prestigious management consulting firms in the world, Boston Consulting takes the fifth position in the list of the toughest companies for job interviews. According to an applicant who appeared for the interview at Boston Consulting said that preparation is quite necessary in order to bag a job at Boston Consulting. Founded in 1963 the company was formed by Bruce D. Henderson, a Vanderbilt University and Harvard Business School alumnus. The company has its headquarters in Boston, Massachusetts, United States.