First the company has to register at the French National Institute for Statistics and Economic Research or INSEE to obtain a SIRET number to be known in France.
Be careful : a delay of one Month is necessary to obtain this siret number and no hiring can be done before !
After giving companies and organisations an adjustment period following the entry into force of the EU General Data Protection Regulation (GDPR) on 25 May 2018, the CNIL intends to step up its inspections and sanctions in the coming months.