This study aims to examine the mediating role of work engagement in the effect of work interfering with the family (WIF) and family interfering with the work (FIW) on employees' employee-rated and supervisor-rated contextual and task performance, drawing on Job Demands and Job Resources model. The sample of the study consisted of 432 healthcare employees and 61 supervisors working for public hospitals in Turkey. We found support for a mediational model such that the relationship between FIW and employee-rated job performance (contextual and task) was mediated by work engagement. Although some studies examined how work–family conflict affects job performance, our knowledge on how these relationships can be mediated through work engagement is still limited. This study further investigates the underlying mechanism in the relationship between WFC and job performance.