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Sergey Kalistratov is a Senior Software Engineer at T-Systems Iberia since June 2023, with a strong background in software development spanning over a decade. Previously, Sergey held positions at Infobip as a Software Engineer, focusing on CPaaS service features, and at Digital League as a Senior Software Engineer Team Lead, responsible for mentoring, task assignment, and project management. Additional experience includes roles at Center IT, RSV, Ural State Technical University, ООО ForgeX, Novatronic, and Logistics Solution Center, primarily in Java and PHP development for various applications and systems. Sergey holds a Master's degree in Mathematics and Computer Science from Ural State University named after A.M.Gorky.