The present study examines whether the relationship between work engagement and job performance is moderated by the extent to which individuals are inclined to work hard, careful, and goal-oriented. On the basis of the literature, it was hypothesized that conscientiousness strengthens the relationship between work engagement and supervisor ratings of task and contextual performance as well as active learning. The hypotheses were tested on a sample of 144 employees from several occupations. Results of moderated structural equation modeling supported the hypotheses. Work engagement was positively related to task performance, contextual performance, and active learning, particularly for employees high in conscientiousness. (Contains 3 tables and 4 figures.)