Between 1993 and 1999 he worked as the 3rd Secretary of the Ministry of Foreign Affairs of Lithuania for Western Europe, Assistant of Director of the Political Department, 1st Secretary of the Political Cooperation Division of the European Integration Department, Head of this Division.

From 1999 to 2001 he worked in Brussels, as an Advisor to the Lithuanian Permanent Mission to the European Union, Minister-Adviser.

Between 2006 and 2009 worked as Secretary of the Ministry of Foreign Affairs of Lithuania, 2009–2010 – Ambassador Extraordinary and Plenipotentiary to the Department of Transatlantic Cooperation and Politics, coordinated the Lithuanian Presidency of the Community of Democracies.

[1] On 19 July 2010 President Dalia Grybauskaitė appointed Pavilionis as Lithuanian Ambassador Extraordinary and Plenipotentiary to the United States and Mexico.

In addition to Lithuanian, which is his native language, he is fluent in English, Italian, Russian, French, German, Latin, and Hebrew.