Aibek Bukabayev enhanced Percona XtraBackup and Percona Server by focusing on MySQL 9.x compatibility, error reporting, and startup reliability. In the percona/percona-xtrabackup repository, he implemented expanded error code support and refined server version validation, using C++ and system programming skills to improve maintainability and future extensibility. For percona/percona-server, he addressed timer thread startup issues after daemonization, refactoring logic for clarity and reliability. He also delivered a feature to reorganize error messages and compatibility checks, streamlining troubleshooting and upgrade processes. His work demonstrated depth in backup and recovery, concurrency, and database administration, with careful attention to review feedback.