As a young adult, Armonaitė was elected chairperson of the Lithuanian Liberal Youth in 2010, after first joining the organization as a teenager.

[4] Armonaitė began her career in 2013, when she was hired as an analyst for the chamber of commerce the Lithuanian Business Confederation (ICC).

[5][6] In 2018, Armonaitė announced her departure from the Liberal Movement, and began to serve in parliament as an unaffiliated politician.

She later joined the newly formed social liberal and progressive Freedom Party, and was elected to serve as its chairperson.

[11] Proposing Ingrida Šimonytė as their prime ministerial candidate, Armonaitė is expected to be one of the three main leaders of the incoming government, in addition to Šimonytė and Liberal Movement leader Viktorija Čmilytė, following in the footsteps of the Marin Cabinet in Finland for having a woman-led government.

[14] On 18 November 2020, Ingrida Šimonytė confirmed that she intended to nominate Armonaitė to serve as minister of economy and innovation in her cabinet.