This is an opinion. Smallish, local companies oftentimes advertise jobs in local and regional newspapers, probably because they are not so inexpensive. Possibly a newspaper like Zürichersee-Zeitung for Altendorf. Some areas have free weekly newspapers and guides which contain job ads.
Many jobs on internet job boards are for unidentified companies using recruiting firms so you don't know who the company is.
The Auslandschweizer-Organisation has a web page with a list of newspapers and job boards in Switzerland. Possibly of use: http://aso.ch/en/consultation/back-t...-to-find-a-job