Kosta Janevski was born on 13.05.1960 in Shtip. He completed primary and secondary school in Strumica, while he completed Faculty of Medicine in Skopje. After completing his studies, he was employed in the General hospital in Strumica. In 2002, he upgraded his education with specialization in internal medicine. He dedicates his working life to the health of people as a doctor internist.
In 2009, he was chosen as a member of the Council of the Municipality of Strumica. After a four-year tenure, in 2013, he was re-elected as a member of the Council of the Municipality of Strumica. In 2016, he was chosen as a member in the Assembly of the Republic of North Macedonia.
He started performing the function of Mayor of the Municipality of Strumica on 20.10.2017.
The Council of the Municipality of Strumica is a representative body of the citizens. It consist of 23 members elected on free and democratic elections.