Using job satisfaction as a mediator, this research analyzes the relationship between employee development and performance at the Musi Banyuasin Regency Inspectorate. A causal associative design was employed in this quantitative research. A total of 138 respondents were randomly selected from 208 civil servant employees. Data were collected using a Likert-scale questionnaire and analyzed using PLS-SEM with SmartPLS version 3.2.9. The research confirms that staff training and development initiatives have a positive impact on job satisfaction. Findings indicate a strong and positive correlation between training and development programs and employee productivity. Employees who are satisfied with their jobs tend to perform better overall. The results of the indirect effects analysis demonstrate that job satisfaction mediates the relationship between training, professional development, and employee performance. The training and development programs attended by Musi Banyuasin Regency Inspectorate staff directly and indirectly improve performance
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