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Sergei Petrunia is an accomplished software developer with extensive experience in database technologies, particularly in query optimization. Since October 2014, Sergei has been contributing to MariaDB Corporation as a Software Developer, focusing on the development of the Query Optimizer and various components of the MariaDB server. Prior to this role, Sergei worked at Monty Program Ab as a Query Optimizer Developer and held positions at SkySQL Corporation Ab and Sun Microsystems, specializing in similar fields. With an academic background in Applied Mathematics from Peter the Great St. Petersburg Polytechnic University, Sergei's career in software development began in 2000, encompassing roles at organizations such as MySQL and Russian Web Service.