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The senior engineer proposes Kafka for the notification system. You have 500 users. The junior engineer proposes a direct function call. The senior engineer is technically correct and strategically wrong. Knowing when good architecture is overkill is the skill that separates senior from staff.

Implement zero-trust networking with Kubernetes NetworkPolicies. Learn default-deny patterns, label-based pod selection, DNS egress, multi-namespace policies, and testing with netshoot.

Master Kubernetes resource requests and limits to prevent OOMKills, CPU throttling, and cascading failures. Learn QoS classes, LimitRange, VPA, HPA, and the complete right-sizing workflow for production workloads.

Stop storing base64-encoded secrets in etcd. Evaluate External Secrets Operator, HashiCorp Vault, Sealed Secrets, and secret rotation strategies for GitOps-native Kubernetes deployments.

Design bulletproof LLM agents with structured tool definitions, parallel execution, result validation, human-in-the-loop gates, and comprehensive observability.