The purpose of this research is to analyze and explain the effect of transformational leadership style, organizational culture, supervision, and career development on the job satisfaction of employees of PT Royal Korindah Purbalingga. This research is quantitative research. Sampling in this study using non-probability sampling with purposive sampling technique with a total of 105 respondents. Data obtained from respondents with research instruments using a questionnaire. The data analysis technique used in this research is descriptive analysis, instrument test, classical assumption test, multiple linear regression analysis test, model fit test and hypothesis test. The results of the study show that partially transformational leadership style has a positive and significant effect on employee job satisfaction, organizational culture has a positive and significant effect on employee job satisfaction, supervision has a positive and significant effect on employee job satisfaction, career development has a positive and significant effect on employee job satisfaction , and simultaneously transformational leadership style, organizational culture, supervision, and career development have a significant effect on employee job satisfaction.