Before being elected as President of the Assembly of the Republic of Macedonia, as an important figure and true representative of successful leadership in the filed of economy in the Republic of Macedonia, Mladenovski worked in the factory for the production of pipes and profiles “11 Oktomvri” in Kumanovo, where he was one of the directors. From 1965 to 1970 Stanko Mladenovski worked in a water supply company as Head Engineer. Two years before being appointed Director of production he was an engineer. In 1984 he became Director of the factory “Iskra” in Kumanovo.
Mladenovski was born on 9 November 1937 in Vracovce, Kumanovo. He graduated from the Technical Faculty, Department of Construction. 1974 to 1981 he was member of the Civil Defense Committee in the Council of the Municipality. He was also member in the working bodies and the social and political organizations in the factories where he worked. From 1967 to 1971 he was Member of the Municipality Conference and the Committee of the Communist Party in the Municipality of Kumanovo; from 1974 to 1980 he was Secretary of the Municipal Committee of the Communist Party of Macedonia, and after that President of the Municipality Conference of the Communist Party of Macedonia. Mladenovski was also Member of the Socialist Alliance of the Working People of Macedonia (SSRNM), from 1974 to 1981, and member of the Central Committee of the Communist Party of Macedonia between the 7th and the 8th Congress.
In the Assembly of the Republic of Macedonia he was a Delegate in the Development and Finance Committee and in the Committee on Urban, Residential and Communal Issues. He was an active member of the Socialist Alliance of the Working People of Macedonia - the largest social and political organization at that time.
Stanko Mladenovski was elected President of the Assembly of the Socialist Republic of Macedonia at the joint session of the three Houses of the Assembly, which was held on 25th April 1985, with a one-year mandate. His election was unanimous, with a public vote from the delegates. One of the items on the agenda of this constitutive session was the debate on the implementation of the constitutional role of the Councils of Associated Labor, as well as some topical issues concerning the functioning and financing of the local communities.
Coming from the field of production and associated labor, Stanko Mladenovski was committed to achieving faster economical development, promotion of the legal efforts in this area, and harmonization of the legislative solutions. He was President of the Assembly of the SRM until 28 April 1986.