After returning to Bucharest, Slăvescu worked as a clerk for the Banca Românească bank. When Romania entered World War I in 1916, he volunteered as officer in the army. Wounded near Brașov, he spent 6 months in a hospital to recover, and then went back to the front in Moldavia. In Iași he met Dimitrie Gusti, Virgil Madgearu, and Ion Răducanu [ro]; with the last two he founded the magazine "Independența economică". In 1918 he returned to work for Banca Românească and for the next three years travelled to Bessarabia, Bukovina, and Transylvania to study the economic and banking issues in those regions.[1] From 1925 to 1947 Slăvescu was a professor at the Bucharest Academy of Economic Studies.
The Romania Academy now sponsors the "Victor Slăvescu Center for Financial and Monetary Studies", located in Bucharest.[1] A street in Pitești is named after him, and so are high schools in Ploiești and Rucăr.