- In 1887, Stanojevic became a full professor of physics and mechanics at the Military Academy. By 1893, he was appointed a full professor of experimental physics at the Velika skola (Great School) in Belgrade
- In the early 20th century, he became a full professor at the University of Belgrade, serving as Dean of the Faculty of Philosophy in 1909. During the 1913/1914 academic year, he was appointed Rector of the University of Belgrade, holding this position until 1919.
- Stanojevic was a close friend and admirer of Nikola Tesla. In 1894, he wrote and published the book Nikola Tesla and His Discoveries
- In 1899, he introduced the first X-ray machine in Serbia and performed radiographic imaging at the Physics Institute of the Velika skola in Belgrade
- In 1904, Stanojevic installed Serbia’s first radiotelegraph station based on Tesla’s system of resonantly tuned dual receiving and transmitting circuits. The transmitter was located in the Physics Cabinet at Kapetan Misa’s Mansion, while the receiver was placed on the building of the Class Lottery in Vasina Street, establishing the first radio connection in Serbia
- As one of the first authors of physics textbooks and a promoter of science in Serbian, he launched the Library for General and Applied Physics in 1905, the first of its kind in Serbia
- Stanojevic advocated for the application of industrial and transport refrigeration to preserve domestic products, especially meat, during transport to European countries. Due to his efforts, Serbia became one of the founding members (1909) of the International Institute of Refrigeration, headquartered in Paris
- A photography enthusiast, Stanojevic was particularly interested in color photography. He created Serbia’s first preserved color photograph, Boy with a Violin (Gypsy Boy with a Violin). As an experienced designer and industrialist, he traveled tirelessly across Serbia, documenting the landscapes and riversides. In 1902, he published Serbia in Pictures, the first photo-monography in the country, featuring color images
- He served as Dean of the Faculty of Philosophy (1909–1913) and Rector of the University of Belgrade (1913–1921), remaining in this role until his death
- Toward the end of his life, Stanojevic bequeathed all his immovable property in his hometown as a legacy to the Negotin Gymnasium. The proceeds were designated to fund the education of one talented and one underprivileged student
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