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Denis Koyvistoynen has a diverse work experience in various roles. Denis started their career in 2010 as an Engineer-Programmer at ГКУСЗ Центр социальной работы Прионежского района and worked there until 2016. In 2016, they worked as a Testing Engineer at RTL Service. In 2017, they took up the role of Network and Computer Systems Administrator at Territorial Compulsory Medical Insurance Fund, where they worked until 2018. Currently, they are employed as a Software Engineer in Test at Doctor Web, Ltd.

Denis Koyvistoynen completed their Bachelor's degree in Informatics and Computer Technology from the Smolny Institute of the Russian Academy of Education, studying from 2013 to 2017. Prior to that, they earned an Engineer's degree in Automated Information Processing and Management Systems from the NOU Petrozavodsk Cooperative Technical School "Karelrespotrebsouz," where they studied from 2006 to 2009. Additionally, in May 2017, they obtained a certificate in "Technical Protection of Confidential Information" from the Educational Center "Eshelon."