Denis has been a criminal defense lawyer for 17 years. He specializes in criminal cases regarding economic, corruption and official crimes. Denis began his career in 1998 as an investigator of Internal affairs agencies focusing on economic crimes. Since 2000 he was engaged in individual legal practice. In 2014, together with partners, he established the law office ZKS Law. Attorneys in Moscow. In 2017 he became a Managing partner of the Firm.
He is an expert at the Office of the Commissioner for the Protection of the Rights of Entrepreneurs under the President of the Russian Federation.