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Sergii Grebennikov has a total of 20 years of work experience. Sergii began their career in 2000 as a Design Engineer at "Служба технічної безпеки "Партнер"". In 2003, they joined ProNET as a Leading Engineer of Security Systems and worked there until 2006. From 2006 onwards, they held the role of Head of Security Systems Department at ProNET.

Sergii Grebennikov obtained a Specialist degree in Instrumentation from the National Technical University of Ukraine 'Kyiv Polytechnic Institute' from 1997 to 2002. In 2012, they obtained an Engineer-Designer degree in Fire Security from the Architectural and Construction Commission of the Ministry of Regional Development, Construction, and Housing and Communal Services of Ukraine.

Additionally, Sergii Grebennikov has obtained several certifications including the 2N Installer Certificate from 2N in April 2023, Responsive Web Design from freeCodeCamp in July 2022, AJAX Fibra Accreditation from Ajax Systems in May 2022, HID Mobile Access Administration from HID Global in September 2021, and SMM Manager from Interra School of Modern Professions in September 2020. Sergii has also obtained certifications in various security systems and technologies such as Physical Access Control Systems Fundamentals from HID Global in November 2019, Milestone Certified Integration Technician (MCIT) from Milestone Technologies, Inc. in September 2017, and Axis Communications Academy Fundamentals from Axis Communications in February 2017. Sergii Grebennikov's certifications also include trainings in RFID technology, CCTV systems, and building integration systems, among others.