Employee engagement is a work place approach where the employees feel attached to their work, motivated to contribute to organizational success and try to give their best each and every day for the success of the company. The core purpose of this research is to define what employee engagement is and if it has any effects on job performance mediated by employee's satisfaction. And for that study to be delivered we have chosen 4 random banks in Beirut and gathered statistics through closed ended questionnaire. About 200 questionnaires were distributed to the staff but only 87 questionnaires were suitable for the study. The study at the end shows that employee satisfaction has a great and important impact on job performance especially in banks, nevertheless, the relation between job engagement and satisfaction was not validated.