A couple other thoughts… Security - not my field but my understanding is you need to understand how programs work but don’t necessarily need to code. For example you need to understand how string buffers work to be able to look for buffer overflow attacks.

Network administration - how do you apply server updates? How often do you update clients? How much replication of active directory is enough but not overkill?

Database administrator - how do you do load balancing? How do you handle backups? How do you deploy new databases?