Nice-to-have: Distributed system tuning (Spark Shuffle, Flink backpressure); data lake technologies (Iceberg/Delta Lake/Paimon); cloud-native big data (EMR/CDH operations, K8s scheduling).
Solid hands-on configuration experience with more than three data centre or enterprise networking solutions such as those from FortiGate, Cisco, Palo Alto, Check Point, F5, Peplink, Arbor, Ruijie, H3C, etc.