Egor Voynov developed MySQL service support for the AVN Service CLI in the aiven/aiven-client repository, enabling users to manage and connect to MySQL services directly through the command line. He implemented handling for the 'mysql' service type and created a helper function to construct the necessary CLI arguments for seamless MySQL instance connections. Working primarily with Python and focusing on backend and CLI development, Egor expanded the CLI’s end-to-end service lifecycle capabilities while reducing manual configuration steps. The work demonstrated a focused, single-feature contribution that deepened the CLI’s utility for MySQL management without introducing bug fixes or broader changes.