Kalfin was a Member of European Parliament between 2009 and 2014. Between 7 November 2014 and May 2016 he served as Deputy Prime-Minister of Bulgaria, and Minister of Labor and Social Policy in the Second Borisov Cabinet.
Kalfin was a Member of European Parliament from 2009 to 2014. He later held positions between November 7, 2014, and May 2016, including Deputy Prime Minister of Bulgaria and Labour and Social Affairs Minister in the Second Borisov Government.