The Role of Job Engagement in Mediating the Relationship Between Psychological Capital, Well-being, and Sustainable Job Performance among Melli Bank Branches’ Managers and Employees

This study delves into the intricate dynamics among psychological capital, well-being, job engagement, and sustainable job performance within Melli Bank branches in Tehran. Employing a correlational research method, 350 managers and employees were selected through convenience sampling. Data were gathered using Koopmans et al.'s Sustainable Job Performance Questionnaire (2013), Luthans' Psychological Capital Questionnaire (2007), Tennant et al.'s Mental Well-being Questionnaire (2007), and Salonava and Shoufeli's Job Engagement Questionnaire (2001). The validity of research tools was confirmed through confirmatory factor analysis, and data were analyzed using structural equation modeling with SPSS and SMART PLS software. Results affirmed the relationship between psychological capital and sustainable job performance. However, the direct relationship between well-being and sustainable job performance was not confirmed. Notably, psychological capital and well-being demonstrated a significant indirect relationship with sustainable job performance through the mediating variable of job engagement.