For ten years Golubiewski lived in Washington, D.C., working in business consulting and cooperating with NGOs, think tanks, and universities, including the Center for Family and Human Rights.[4][5] He was an intern at US Senator Richard Lugar's office.
In 2008, he joined the European Commission in Brussels, and in 2011 in the newly established European External Action Service. Golubiewski dealt with the regional policy of eastern Africa and the countries of the Indian Ocean, participating in trade negotiations with the ACP economic bloc. From 2014 to 2016, he was the deputy ambassador of the European Union to the EU Delegation in Beirut, and its head of the political and media section.[6][7]
Golubiewski is a member of the advisory committee at the Catholic University of America. He was an expert at the Sobieski Institute and the National Center for Strategic Studies.[11]