The ‘Fonction Publique’ (civil service) website advertises jobs in the public sector. To look for a job you will need to register on the ‘Plateforme de Gestion des Demandes d'Emploi’ website, which is a platform for job-seekers. You can create a personal profile. Be sure to keep your contact details up-to-date so that you can be notified when a suitable job comes up.
If you would like to apply for a specific job, you will have to send in your CV and a covering letter. The website is operated by the Ministry of Public Service. You have to be at least 18 years old. You can use the website free of charge.