Working for the UN
For careers in international organisations he following two websites are useful resources.
Careers in international organisations
The FDFA has been tasked with increasing the number of Swiss nationals working in international organisations because of Switzerland's under-representation in a number of them. If you are interested in working for an international organisation the FDFA recommends that you contact the candidatures section, which can help you with the application process.
Careers in international organisations
Working with multilateral organisations
cinfo, the Centre for Information, Counselling and Training for Professions relating to International Cooperation, has been mandated by the Swiss Agency for Development and Cooperation (SDC) and the State Secretariat for Economic Affairs (SECO) to inform the Swiss public of career and job opportunities in international cooperation and to support individual job seekers.
Working with multilateral organisations