O. Šibkovas mostly examined criminal cases of fraud, property misappropriation or embezzlement, crimes against the financial system. The latter crimes are the main specialisation of the lawyer.
Olegas also gives seminars on various topics of criminal law and takes part in international conferences on financial crimes and tax fraud. He lectures in Vytautas Magnus University on criminal law on topics related to crimes in business and crimes against the financial system. Olegas has written a number of scientific articles on these issues, he is also a co-author of the textbook “Lithuanian Criminal Law” (Special Part, Book Two).
O. Šibkovas took part in drafting articles of the Criminal Code. From November 2012 to December 2014 Olegas was a member of the Judicial Court of Honour, he is also a member of the Committee for Supervision over the Criminal Procedure Code under the Ministry of Justice of the Republic of Lithuania.