This study aims to verify the relationship between the HR department's expertise and job satisfaction. To examine this purpose, a statistical analysis was conducted on the human capital panel data provided by the Vocational Competency Development Institute in 2023 using the STATA statistical package. As a result, it was found that the expertise of the HR department had a positive (+) effect on job satisfaction and the talent preference policy. In addition, it was found that the talent preference policy for core human resources had a positive (+) effect on job satisfaction. Finally, it was found that the talent preference policy had a partial mediating effect between the expertise and job satisfaction of the HR department. Putting these results together, it suggests that the expertise of the HR department is a prerequisite that can positively lead the overall feelings of core human resources toward their job. In addition, it suggests that the HR department's expertise promotion should be preceded for the effectiveness of the talent preference policy, which is a human resource management plan that is the function of the HR department. Furthermore, in order to effectively manage the risks of industrial security that may arise from core personnel, it not only promotes the expertise of the HR department, but also shows the need for a human resource management strategy in the HR department with expertise.