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Sergejs Kostins is a Frontend Developer at CODELEX since December 2022, specializing in JavaScript, TypeScript, React, HTML, CSS, Git, and TDD. Prior to this, Sergejs served as the Head of the Technical Operation Department at Baltcom from June 2013 to March 2022, overseeing network operation planning, provisioning, and modernization. Experience also includes a role as Senior Operating Technician at EST Risinājumi, where network operations were managed from July 2009 to May 2013, and as a Senior Assembly Specialist at BALTINET DATA, ensuring network operation functionality from September 2008 to June 2009. Earlier positions included Installer at Uninet and Electrician at ET DIENESTS, where technical duties involved designing, installing, and servicing communication systems and constructing electrical networks. Sergejs obtained a professional qualification in Electrical Installation and Electromechanics from the Professional Secondary School no. 46 of Riga from September 2002 to June 2005.