Strong hands-on expertise with architecture, configuration, WAL, MVCC, VACUUM/autovacuum, XID wraparound, locking, query plans, indexing, partitioning, statistics, extensions, replication, upgrades, migration, and troubleshooting. Strong RHEL/Linux skills including systemd, filesystem/LVM, networking, SELinux, firewall, kernel/sysctl, ulimits, storage/I/O diagnostics and shell scripting.