After graduation he worked in the technical office of construction company "Špiller, Juzbašić and Šurina". From 1921 until 1923 he was employed at the office of Ignjat Fischer. For some time Šterk worked in the Zagreb construction office. He was one of the first assistant at the Technical university in Zagreb and one of the founding board members"Work for the people - a society of the Jewish and Anti-Zionist asimilants in Croatia" which was established in 1922. Šterk passed the practical exam for architects in 1922 and from 1923 he was an independent licensed architect in Zagreb. He projected part of the interior of the Yugoslav pavilion in Paris in 1925, which was designed by architect Stjepan Hribar, and a portion of the interior of the Yugoslav pavilion in Barcelona, which was designed by architect Dragiša Brašovan in 1929. Šterk designed and carried out lots of villas, residential houses and other buildings in Zagreb, the Zagreb area, Slavonski Brod, Požega, Osijek and Vinkovci. In 1931 he participated in the first exhibition of Yugoslav contemporary architecture in Belgrade, and in 1938 in the exhibition "Half a Century of Croatian Art" in Zagreb. Šterk was member of the society "Narodni rad - društvo židovskih asimilanata i anticionista u Hrvatskoj".
Šterk came seriously sick in 1936. He died from leukemia in Zagreb on 6 March 1941 and was buried at the Mirogoj Cemetery. His widow Aleksandrina and sons Vojko and Veljko continued to live in Zagreb until 1949, when they emigrated to Israel. In 2009 his son Vojko Šterk, after eight years and only from the third attempt, finally was granted with Croatian citizenship which was deprived from him during his family emigration to Israel in 1949. He now holds both Israel and Croatian passport.
Works
Corner semi-detached business building Slavonija d.d., Savska street 23, Zagreb. 1923
Built-in residential building Omega d.d., King Zvonimir street 3, Zagreb. 1923 - 1924
Built-in residential and commercial building Präger, Ivana Gundulića street 3, Zagreb. 1926 - 1927
Detached residential building Schönbaum, Tuškanac street 25, Zagreb. 1926
Corner built-in residential and commercial building Gross, British square 12, Zagreb. 1927–1928
Detached residential building Bogdanović, Tuškanac street 90, Zagreb. 1927 - 1929
Corner built-in residential building Draganec, King Petar Krešimir IV square 17, Zagreb. 1927 - 1928
Remodeling of the built-in residential building Jureša, Gjuro Deželić boulevard 43, Zagreb. 1928 - 1931