diff --git a/.github/workflows/kustomize-gateway-api.yaml b/.github/workflows/kustomize-gateway-api.yaml
new file mode 100644
index 00000000..a87e11e7
--- /dev/null
+++ b/.github/workflows/kustomize-gateway-api.yaml
@@ -0,0 +1,33 @@
+name: Kustomize GitHub Actions for Gateway API
+
+on:
+  pull_request:
+    paths:
+      - kustomize/gateway/**
+      - .github/workflows/kustomize-gateway-api.yaml
+jobs:
+  kustomize:
+    name: Kustomize
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: azure/setup-helm@v3
+        with:
+          version: latest
+          token: "${{ secrets.GITHUB_TOKEN }}"
+        id: helm
+      - name: Kustomize Install
+        working-directory: /usr/local/bin/
+        run: |
+          if [ ! -f /usr/local/bin/kustomize ]; then
+            curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh" | sudo bash
+          fi
+      - name: Run Kustomize Build
+        run: |
+          kustomize build kustomize/gateway/ --enable-helm --helm-command ${{ steps.helm.outputs.helm-path }} > /tmp/rendered.yaml
+      - name: Return Kustomize Build
+        uses: actions/upload-artifact@v2
+        with:
+          name: kustomize-gateway-artifact
+          path: /tmp/rendered.yaml
diff --git a/kustomize/gateway/alertmanager-routes.yaml b/kustomize/gateway/alertmanager-routes.yaml
new file mode 100644
index 00000000..44ea44b5
--- /dev/null
+++ b/kustomize/gateway/alertmanager-routes.yaml
@@ -0,0 +1,16 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: alertmanger-gateway-route
+  namespace: prometheus
+spec:
+  parentRefs:
+  - name: flex-gateway
+    sectionName: http
+    namespace: nginx-gateway
+  hostnames:
+  - "alertmanager.sjc.ohthree.com"
+  rules:
+    - backendRefs:
+      - name: kube-prometheus-stack-alertmanager
+        port: 9093
diff --git a/kustomize/gateway/internal-gateway-api.yaml b/kustomize/gateway/internal-gateway-api.yaml
new file mode 100644
index 00000000..de2604a1
--- /dev/null
+++ b/kustomize/gateway/internal-gateway-api.yaml
@@ -0,0 +1,15 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: flex-gateway
+  namespace: nginx-gateway
+spec:
+  gatewayClassName: nginx
+  listeners:
+  - name: http
+    port: 80
+    protocol: HTTP
+    hostname: "*.sjc.ohthree.com"
+    allowedRoutes:
+      namespaces:
+        from: All
diff --git a/kustomize/gateway/kustomization.yaml b/kustomize/gateway/kustomization.yaml
new file mode 100644
index 00000000..eeb4fb4f
--- /dev/null
+++ b/kustomize/gateway/kustomization.yaml
@@ -0,0 +1,4 @@
+resources:
+  - internal-gateway-api.yaml # namespace: nginx-gateway (common gateway)
+  - alertmanager-routes.yaml  # namespace: prometheus
+  - prometheus-routes.yaml    # namespace: prometheus
diff --git a/kustomize/gateway/prometheus-routes.yaml b/kustomize/gateway/prometheus-routes.yaml
new file mode 100644
index 00000000..a3874b8e
--- /dev/null
+++ b/kustomize/gateway/prometheus-routes.yaml
@@ -0,0 +1,16 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: prometheus-gateway-route
+  namespace: prometheus
+spec:
+  parentRefs:
+  - name: flex-gateway
+    sectionName: http
+    namespace: nginx-gateway
+  hostnames:
+  - "prometheus.sjc.ohthree.com"
+  rules:
+    - backendRefs:
+      - name: kube-prometheus-stack-prometheus
+        port: 9090