Between 1976 and 1977 he was a fellow of Technical University of Eindhoven and between 1978 and 1979 a fellow of Dutch Organization for Pure Scientific Research (ZWO). Between 1980 and 1986 Hajdasinski held a position of Associate Professor in Systems Theory at Technical University of Eindhoven, the Netherlands and between 1986 and 2003 he worked with a number of prime ICT and Consulting companies ( a.o. Volmac Nederland, Cap Volmac, Pink Roccade and KPMG). Starting November, 2003, Hajdasinski holds a position of Business Development Executive with Capgemini Outsourcing B.V.
During his professional career Hajdasinski has delivered 42 full scope industrial projects in the Netherlands, Germany, France, UK, Poland, USA, Finland and Norway. He is an author of 30 international publications in renowned international journals, 25 conference papers and he has been a chairman of many international conferences, academic advisor and industry advisor. His hobbies are: international politics, guitar playing, sport bridge and reading.