Sommaruga held the directorship of the Consumer Protection Foundation (German: Stiftung für Konsumentenschutz) from 1993 to 1999, which earned her public recognition in the German-speaking part of Switzerland, where it was active. She held the presidency of that foundation from 2000 to 2010, as well as that of the aid organisation Swissaid from 2003 to 2008. She was also patron of SAFFA 2020, alongside then-Federal Councillors Doris Leuthard and Eveline Widmer-Schlumpf, as well as former Federal Councillor Micheline Calmy-Rey.[8]
On 11 August 2010, she announced her candidacy to succeed fellow party member Moritz Leuenberger, who had announced his resignation, in the upcoming election to the Federal Council.[10] Sommaruga was elected by the Federal Assembly on 22 September 2010.[9] She was eventually elected for a full four-year term in 2011, before successfully seeking reelection in 2015 and 2019.
On 4 December 2013, Sommaruga was elected as Vice President of Switzerland by the Federal Assembly for 2014, alongside Didier Burkhalter, who was elected President of the Swiss Confederation. On 3 December 2014, she was elected to the presidency for 2015, alongside Johann Schneider-Ammann as Vice President of Switzerland. Her first international presidential trip was to Paris, where she joined the Republican marches of 11 January 2015, organised to defend freedom of speech following the Charlie Hebdo shooting perpetrated by Islamic terrorists. She served as President of the Confederation until 31 December 2015, when Schneider-Ammann succeeded her.
On 1 January 2019, she returned to the vice presidency under President Ueli Maurer. Sommaruga became President of the Swiss Confederation again in 2020, a year marked by the COVID-19 pandemic.[11] She was succeeded by Guy Parmelin on 1 January 2021.
On 2 November 2022, she announced her upcoming resignation from the Federal Council. She stated the decision had come abruptly following a stroke suffered by her husband.[12]
^"Patronat" (in German). 2020.ch. Archived from the original on 3 March 2016. Retrieved 2 December 2014.
^ abcUVEK, Eidgenössisches Departement für Umwelt, Verkehr, Energie und Kommunikation. "Lebenslauf". uvek.admin.ch (in German). Retrieved 31 July 2019.{{cite web}}: CS1 maint: multiple names: authors list (link)