On 1 March 2005, became senior consultant in the Law and Economics Department of the Presidential Administration of newly elected President Sergei Bagapsh.[1] On 9 January 2009, Shamba was promoted to Head the Legal Sector of the Law and Economics Department,[1] and on 12 January, he was additionally appointed as Plenipotentiary Representative of the President to the People's Assembly.[2] Following the death of Bagapsh in 2011, his successor Alexander Ankvab promoted Shamba to First Deputy Head of the Presidential Administration on 11 October 2011, in place of Zurab Kajaja (in addition to his role as Representative to Parliament).[3] Following the resignation of Ankvab during the May 2014 revolution and the subsequent election of Raul Khajimba, Shamba was one of few officials to retain his post, being reappointed on 1 October 2014.[4] On two occasions, Shamba temporarily served as acting Head of the Presidential Administration, following the resignation of Astamur Tania on 6 May 2016 and the appointment of Beslan Bartsits as Prime Minister on 5 August 2016.[5][6]
