diff --git a/secretstores/jenkins-admin-credentials.yaml b/secretstores/jenkins-admin-credentials.yaml
new file mode 100644
index 0000000..5ba7608
--- /dev/null
+++ b/secretstores/jenkins-admin-credentials.yaml
@@ -0,0 +1,26 @@
+# Unlike gitea-admin-credentials, this one's Vault-backed from day one —
+# no manual kubectl-created Secret ever existed for Jenkins. Keys match
+# what the chart's controller.admin.userKey/passwordKey expect — see
+# devops-infra-helm-charts/helm-overrides/k8s-admin-prd-ase1/jenkins/custom-values.yaml.
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: jenkins-admin-credentials
+  namespace: jenkins
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault-backend
+    kind: ClusterSecretStore
+  target:
+    name: jenkins-admin-credentials
+    creationPolicy: Owner
+  data:
+    - secretKey: jenkins-admin-user
+      remoteRef:
+        key: jenkins/admin
+        property: username
+    - secretKey: jenkins-admin-password
+      remoteRef:
+        key: jenkins/admin
+        property: password
diff --git a/values/incubator-infra-k8s-admin-prd-ase1-values.yaml b/values/incubator-infra-k8s-admin-prd-ase1-values.yaml
index b21916d..52f85c4 100644
--- a/values/incubator-infra-k8s-admin-prd-ase1-values.yaml
+++ b/values/incubator-infra-k8s-admin-prd-ase1-values.yaml
@@ -90,4 +90,15 @@ appSpec:
     # 256KiB last-applied-configuration annotation limit on a normal
     # client-side apply. SSA sidesteps it entirely — see the note in
     # generic-argo-apps-chart's template.
-    serverSideApply: true
\ No newline at end of file
+    serverSideApply: true
+  - name: jenkins
+    # Fresh install, but pinning nameOverride anyway — learned from
+    # external-secrets that skipping it produces
+    # "jenkins-admin-prd"-suffixed resource names, which
+    # jenkins-admin-credentials (the ExternalSecret, namespace "jenkins")
+    # doesn't need to care about, but keeps naming predictable and
+    # consistent with every other app here regardless.
+    nameOverride: jenkins
+    namespace: jenkins
+    chartDir: jenkins
+    valuesDir: jenkins
\ No newline at end of file