Find here an announcement of a full professor position: https://iscpif.fr/2018/10/full-professor-position-lptm-universite-de-cergy-pontoise/ . Interested candidates who do not yet have a qualification for French professor positions are encouraged to apply at https://www.galaxie.enseignementsup-recherche.gouv.fr/ensup/cand_qualification_droit_commun.htm (registration deadline coming up soon: October 24 !). Recommended sections are 29, 28, and/or 30, depending on the profile.