As an international student in Ireland, the government permits you to extend your visa for up to 6 months in order to find a job as part of the Third Level Graduate Scheme.
Under the Third Level Graduate Scheme, you can find a job and then apply for a work permit or a green card.
As a student, if you are looking to work while studying, you are permitted to, for up to 20 hours a week during the semester, and 40 hours per week during vacations.