He founded and managed Rimaco GmbH in Vienna, Austria (1991–2006) and Rimaco Corp. in Naples, Florida, USA (from 2002).
He has been a vocal critic of the early post-independence privatization processes in North Macedonia, describing them as "cardinal mistakes" that favored internal managers over strategic growth. Philanthropy and Honors
Gusterov’s career began in the early 2000s, a wild west period for Macedonian internet. While legacy outlets like Nova Makedonija struggled to adapt, Gusterov recognized the power of search traffic. He reportedly made his first significant money through domain parking—buying high-value .mk domains and redirecting their traffic to ad-laden landing pages.