إمارة صربيا
Aleksa first came to the Principality of Serbia from Srem, then a Habsburg-occupied territory, in 1819. He was hired as a clerk in the office of Prince Miloš Obrenović. In 1835, Simić becomes the Minister of Finance, and in 1842 he served as Prince Miloš's diplomatic envoy in negotiations with the Ottomans at Constantinople. In 1843 he becomes the Minister of Foreign Affairs of the Principality of Serbia.