This paper discusses person-job fit (PJF) and person-organization fit (POF) in a mismatched work environment and examines their relationship with employee satisfaction and performance. The data was obtained from the distribution of electronic questionnaires to 452 employees working in Indonesia. Data analysis used structural equation modelling (SEM), and the results showed that PJF was positively correlated with POF. Both were positively related to job satisfaction, and were consistent across all aspects of the test. Similarly, the relationship between POF and performance, but the relationship between PJF and performance is inconsistent. In general, PJF is positively related to performance, but in work environment mismatch the relationship is negative, and it varies widely from a demographic perspective. In addition, job satisfaction is positively related to performance, but it does not mediate the relationship between POF and performance. In general, the mediating effect of satisfaction on the relationship between PJF and performance was not proven, but it was proven in the work environment mismatch. From a demographic perspective, the mediating effect is only evident in certain types of demographics.