This study aims to analyze the effect of job design and work environment on human resource development, with skills and expertise as an intervening variable at PT Berkat Samudra Gemilang Lines. The research uses a quantitative approach with a survey method targeting company employees as respondents. Data were collected through questionnaires prepared based on indicators for each variable, while data analysis was conducted using Structural Equation Modeling (SEM) based on Partial Least Squares (PLS). The results show that job design and work environment have a positive and significant effect on employees' skills and expertise. Furthermore, skills and expertise are proven to have a positive and significant impact on human resource development. In addition, skills and expertise are able to mediate the influence of job design and work environment on human resource development This finding indicates that improving the quality of work design and the work environment is an important strategy for strengthening employee competence and supporting sustainable human resource development at PT Berkat Samudra Gemilang Lines.
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