Security & identity depth (Staff bar): Strong applied security engineering — workload identity (SPIFFE/SPIRE, Workload Identity Federation), service mesh mTLS (Istio), OAuth 2.0 / OIDC, token exchange, JIT/short-lived scoped credentials, secrets/KMS envelope encryption, least-privilege and zero-trust patterns, and threat modeling for adversarial workloads (confused-deputy, prompt injection, data exfiltration). Design, build, and operate the multi-tenant control plane and per-user runtime on private GKE — the Kubernetes operators (CRDs/controller-runtime), Helm charts, gVisor-sandboxed pods, and per-user isolation primitives (KSA/GSA, Workload Identity, NetworkPolicy, per-user workspaces) that reconcile one user into a fully wired, isolated environment.