The purpose of this study is to analyze the effect of family socioeconomic background on university rankings, efforts in VETs, and job satisfaction of university graduates. The family socioeconomic background and mediation potential, which are independent variables, are identified through university rankings to identify mechanisms that affect job satisfaction that may appear to college graduates, and political and practical implications for strengthening job satisfaction are presented. An analysis was conducted using panel data from the Graduate Occupational Mobility Survey, obtained from the Korea Employment Information Service. The data analysis was performed using SPSS21.0 and AMOS22.0. Consequently, the following conclusions were drawn. First, the family socioeconomic background significantly impacts job satisfaction. Second, the influence of family socioeconomic background on job satisfaction is further amplified with university rankings as a parameter. Third, the level of influence of family socioeconomic background on job satisfaction did not change according to the characteristics of VET participation as a mediator. The threat of human labor replaced by technology, the possibility of creating new industries and new jobs, and the diversification of employment types such as platform labor are accelerating with the advent of the 4th Industrial Revolution. Our study of the subjective perception of individual occupations could provide a driving force for maintaining jobs in the long run and leading to success in this changing labor market.