Wikipedia mentions that citizens of certain Annex II countries are eligible to work in some parts of the Schengen area during their short-term stay. However several aspects are not entirely clear:
- Does the right to work get activated automatically upon arrival?
- Are immigration officials aware of this law, so one can safely announce their intention to work upon arrival?
- What documentation can be showed to would-be employers to prove that this rule exists on the books?
- Are there any websites specifically catering to Annex II individuals seeking short-term work in the Schengen area?
Note that since the default 90 out of 180 rule still applies to such trips, this question is on-topic for Travel.SE.