This study adopts Person-Environment (P-E) Fit theory as a theoretical perspective to empirically investigate the mediating role of achievement motivation and job satisfaction in affecting Teacher Person-Organization (P-O) Fit on intention to stay. The sample consists of 128 teachers from private junior high schools in Pekanbaru. The data were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM). This study proposes achievement motivation and job satisfaction as strategies to improve junior high school teacher performance. The findings reveal that Person-Organization Fit directly affects teachers' intention to stay. However, achievement motivation does not mediate the effect of P-O Fit on intention to stay. Conversely, job satisfaction does mediate the effect of P-O Fit on intention to stay. These findings indicate that P-O Fit job satisfaction strengthens Person-Environment (P-E) Fit theory in relation to reconfiguring internal human resource competencies to respond to environmental, organizational-person changes quickly.