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Alexander Kuzmenkov has worked in the software engineering industry since 2009. From 2009 to 2010, they were a software engineer at GA Group, where they developed client software for color cathodoluminescence imaging in scanning electron microscopy. From 2010 to 2016, they were a FlexiCapture developer at ABBYY, where they worked on a platform for document capture, focusing on business logic and distributed processing. From 2016 to 2019, they were a Postgres core developer at Postgres Professional, where they contributed to PostgreSQL community releases from 10 to 13 and Postgres Professional forks, focusing on performance optimizations and query planning. Since 2019, they have been a ClickHouse core developer at ClickHouse, where they implemented the support for window functions and created a robust system of performance testing that runs on a per-commit basis. Since 2021, they have been a Core Database Developer at Timescale.

Alexander Kuzmenkov attended Lomonosov Moscow State University (MSU) from 2005 to 2011, studying fisica.