This study aims to examine and analyze the influence of Transformational Leadership and Organizational Culture on Employee Performance through High-Performance Work System as a mediating variable at the Makassar Type B Customs and Excise Supervision and Service Office. This study uses a quantitative approach involving 126 employees as respondents. Data were collected through questionnaires and analyzed using Structural Equation Modeling–Partial Least Squares (SEM- PLS). The results show that Transformational Leadership has a positive but insignificant effect on Employee Performance and Organizational Culture has a positive but insignificant effect on Employee Performance. High-Performance Work System has a positive and significant effect on Employee Performance. Transformational Leadership and Organizational Culture each have a positive and significant effect on High-Performance Work System. Furthermore, High-Performance Work System is able to positively and significantly mediate the influence of Transformational Leadership and Organizational Culture on Employee Performance. These results indicate that High- Performance Work System plays a full mediation role in both relationships. These findings confirm that improving Employee Performance is more effective when Transformational Leadership and Organizational Culture are realized through a human resource management system that increases employee capabilities, motivation, and opportunities to participate.
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