Performance of employee brings organization’s achievements in the business world where rivalry among the organizations is very common. In this connection, the academicians and practitioners do struggle to reach a conclusion about the determinants of employee performance. As a result, the study endeavors to develop a structural equation model with the help of PLS technique in determining the relationship among employee relations with supervisor, employee engagement, and employee performance in the context of developing country. The opinions of 392 employees have been collected through survey method who works in the ready-made garment industry in Bangladesh. The findings of the study revealed that employee relations with supervisor have influence on employee performance and employee engagement; and employee engagement mediates employee relations and employee performance relationship. Therefore, the model is expected to be used in the developing context as a method for increasing employee performance.