Registration process

Foreign workers from the EU/EFTA countries can work in Switzerland without a permit, but with compulsory registration, for up to 90 working days per calendar year. 

You can register here online with the Federal Ministry of Justice and Police (FMJP).

More information is available here from the State Secretariat for Migration (SSM)
 

https://www.arbeit.swiss/content/secoalv/en/home/menue/unternehmen/europaeische-arbeitsvermittlung---eures/meldeverfahren.html