1. Linux Admin on RHEL 7. This is the must have skills.
2. Knowledge of networking concepts such as F5 / GTM / LTM / Certs / LB etc within infrastructure space. This is very important skill set.
3. Knowledge of Private / Public Cloud. Knowledge of Docker / Container / Kubernetes. Experience working in Private / Public cloud is a plus.
4. Scripting knowledge. This isn't a must have skill set but still very important to drive automation.