For his work as a military physician during the Romanian Campaign of World War I, Gomoiu was decorated with the Order of the Crown (1917), the Order of the Star of Romania (1918), and the Queen Marie Cross (1919). He subsequently served terms as head of the Union of Reserve Officers, and, in 1920–1921, was curator (or "efor") of Bucharest's civilian hospitals. The author of "Hommage a la France et aux médecins français" ("A Homage to France and French Physicians", 1918), Gomoiu was made a chevalier of the Legion of Honor in 1922. Between 1919 and 1942, he was a surgeon at the Oradea war hospital and at two hospitals in Bucharest, also working at Brâncovenesc Hospital. Meanwhile, he held various leadership roles in medical societies and administrative bodies, and, in 1921, became a professor at Bucharest University.