We examine how job crafting (i.e. seeking resources, seeking challenges, decreasing demands) increases the person-job fit of employees. In Study 1, we studied job crafting's effects over time. 111 employees filled out a questionnaire at two time points with 6 months in between. We found that seeking resources behavior at Time 1 positively affected work engagement, task performance, and career satisfaction at Time 2. Decreasing demands at Time 1 negatively affected work engagement, task performance, and career satisfaction at Time 2. In Study 2, we tested a job crafting intervention using a quasi-experimental design (i.e., intervention group, N = 60, and a control group, N = 59). The intervention was successful, as participants in the intervention group increased seeking resources and decreasing demands behaviors. Furthermore, seeking resources behavior was the main driver of increased participants' work engagement, task performance, and career satisfaction.