From 2012, she also served as founder and board member of the Innovationsforum Energiewende, a group convening unions and companies from the energy sector and energy-intensive industries.

She was a member of the federal executive board of the party's youth organization and from 2009 to 2013 deputy chairwoman of the SPD in Hannover.

From 2016 until 2018, Fahimi served as State Secretary at the Federal Ministry of Labour and Social Affairs under the leadership of minister Andrea Nahles.

As deputy member of the Committee on Foreign Affairs, she is her parliamentary group's rapporteur on relations to Latin America, the Caribbean, Spain, Portugal, Italy and Malta.

Fahimi's partner, Michael Vassiliadis, head of IG Bergbau, Chemie, Energie, made himself available for the office but was eventually opposed by ver.di, one of the main unions in DGB.