[1] After her studies, Ságvári worked in a factory between 1944 and 1945 and then became an administrator at the Hungarian Communist Party center beginning in 1945.

[1][5] During the same period, Ságvári was studying history and political economics at Pázmány Péter Catholic University and graduated in 1951.

In 1956 she was appointed to the commissioner's office of the Hungarian Socialist Workers' Central Committee and in 1960 was made a senior research fellow and deputy director of the Party History Institute.

Because the old Town Hall building had insufficient space, and documents were located at various holding sites throughout the city, the first task was to collect them and organize them.

In addition to writing and promoting the archive, she worked with the Association of Hungarian Librarians to create a series for the study of the city history.

[1][2] After she left the Archives, Ságvári continued her career at Budapest University, serving as the chair of the department on Administrative and Comparative History of the 20th Century, until her retirement in 1998.