Sebastian Stefanović has worked at the diagnostic centre Diagnostični center Bled since 2021. He passed the specialist exam in the field of gastroenterology with honours on 29 October 2021. He passed the USMLE (The United States Medical Licensing Examination) and obtained the ECFMG certificate in August 2018. Under the mentorship of Prof. Dr. Peter V. Draganov at the University of Florida in November 2019, he attended additional training in advanced endoscopic techniques. He performs specialist examinations and endoscopic gastroscopy and colonoscopy examinations at the gastroenterology clinic of the diagnostic centre Diagnostični center Bled. He has also been the secretary of the Slovenian Society for Gastroenterology and Hepatology since November 2021.