On 6 June 2013, Ķirsis received the mandate of the 11th Saeima deputy for the period while party member Vyacheslavs Dombrovskis was serving as a minister.

In 2019, he became an adviser to the Minister of Foreign Affairs, Edgars Rinkēvičs, on economic and energy policy issues.

In the 2020 extraordinary Riga City Council elections, Ķirsis ran as the leader of the list of the association "Jaunā Vienotība" and was re-elected to the municipality, elected as one of the three deputies of the Chairman of the Riga City Council, Mārtiņš Staķis.

On 2 October 2020, he was sworn in as deputy mayor for urban development, planning and transport.

[5] In the summer of 2023, the leading coalition of the Riga City Council collapsed, one of the reasons was possible illegality in the construction projects of the traffic area, for which the responsibility of the deputy chairman of the city council, Ķirsis, was in the municipality.