Upon his return to his country Chile, Raineri joined the Department of Industrial Engineering and of the School of Engineering Systems at his
Alma mater, the Pontifical Catholic University of Chile, as a professor and researcher. He would later become the
director of the department between April 1998 and April 2002. He was also managing director and economic coordinator in the Department of Industrial Engineering and Systems between March 1994 and October 1995. He collaborated with Sebastián Piñera as a coordinator in the area of energy of the group Tantauco.'''' In 2012, he was appointed as alternate executive director of the World Bank Group representing Argentina, Bolivia, Chile, Paraguay, Peru, and Uruguay. In 2012, he was elected by experts around the world for a period of two years as vice president for academic affairs of the International Association for Energy Economics. In 2014 was re-elected for a second two-year term (2015–16). In 2015 he was elected as IAEE president-elect for 2016 and as IAEE president for 2017. ==Politics==