diff --git a/.github/workflows/lab4.yml b/.github/workflows/lab4.yml
new file mode 100644
index 0000000..5160a94
--- /dev/null
+++ b/.github/workflows/lab4.yml
@@ -0,0 +1,18 @@
+name: Lab 4 - Helm Chart Grading
+
+on: [push]
+
+jobs:
+  helm-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Helm
+        uses: azure/setup-helm@v4.2.0
+
+      - name: Run Lab 4 Tests
+        run: |
+          chmod +x ./tests/lab4_test.sh
+          ./tests/lab4_test.sh
\ No newline at end of file
diff --git a/charts/ecommerce-app/Chart.yaml b/charts/ecommerce-app/Chart.yaml
new file mode 100644
index 0000000..e3e99ea
--- /dev/null
+++ b/charts/ecommerce-app/Chart.yaml
@@ -0,0 +1,6 @@
+apiVersion: v2
+name: ecommerce-app
+description: Helm chart for ServiceStation project
+type: application
+version: 0.1.0
+appVersion: "1.0.0"
\ No newline at end of file
diff --git a/charts/ecommerce-app/templates/configmap.yaml b/charts/ecommerce-app/templates/configmap.yaml
new file mode 100644
index 0000000..a0dfb61
--- /dev/null
+++ b/charts/ecommerce-app/templates/configmap.yaml
@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: app-config
+data:
+  DB_USER: {{ .Values.postgres.dbUser | quote }}
+  DB_HOST: "db-service"
+  DB_PORT: "5432"
+  DB_NAME: {{ .Values.postgres.dbName | quote }}
+  DATABASE_URL: "postgresql://{{ .Values.postgres.dbUser }}:{{ .Values.secrets.dbPassword }}@db-service:5432/{{ .Values.postgres.dbName }}?schema=public"
+  PORT: "8080"
+  JWT_EXPIRE: "1d"
+  GOOGLE_CALLBACK_URL: "http://localhost:8080/api/auth/google/callback"
+  CLIENT_URL: "http://localhost:80"
\ No newline at end of file
diff --git a/charts/ecommerce-app/templates/deployment.yaml b/charts/ecommerce-app/templates/deployment.yaml
new file mode 100644
index 0000000..2b72efd
--- /dev/null
+++ b/charts/ecommerce-app/templates/deployment.yaml
@@ -0,0 +1,37 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: ecommerce-app
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app: ecommerce-app
+  template:
+    metadata:
+      labels:
+        app: ecommerce-app
+    spec:
+      containers:
+        - name: ecommerce-app
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: 8080
+          resources:
+            {{ toYaml .Values.resources | nindent 12 }}
+          envFrom:
+            - secretRef:
+                name: app-secret
+            - configMapRef:
+                name: app-config
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            initialDelaySeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            initialDelaySeconds: 15
\ No newline at end of file
diff --git a/charts/ecommerce-app/templates/postgres.yaml b/charts/ecommerce-app/templates/postgres.yaml
new file mode 100644
index 0000000..349d4f6
--- /dev/null
+++ b/charts/ecommerce-app/templates/postgres.yaml
@@ -0,0 +1,38 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres-deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: postgres
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: {{ .Values.postgres.image }}
+          ports:
+            - containerPort: 5432
+          env:
+            - name: POSTGRES_USER
+              value: {{ .Values.postgres.dbUser | quote }}
+            - name: POSTGRES_PASSWORD
+              value: {{ .Values.secrets.dbPassword | quote }}
+            - name: POSTGRES_DB
+              value: {{ .Values.postgres.dbName | quote }}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: db-service
+spec:
+  type: ClusterIP
+  selector:
+    app: postgres
+  ports:
+    - port: 5432
+      targetPort: 5432
\ No newline at end of file
diff --git a/charts/ecommerce-app/templates/secret.yaml b/charts/ecommerce-app/templates/secret.yaml
new file mode 100644
index 0000000..c0888e9
--- /dev/null
+++ b/charts/ecommerce-app/templates/secret.yaml
@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: app-secret
+type: Opaque
+stringData:
+  DB_PASSWORD: {{ .Values.secrets.dbPassword | quote }}
+  JWT_SECRET: {{ .Values.secrets.jwtSecret | quote }}
+  GOOGLE_CLIENT_ID: {{ .Values.secrets.googleClientId | quote }}
+  GOOGLE_CLIENT_SECRET: {{ .Values.secrets.googleClientSecret | quote }}
\ No newline at end of file
diff --git a/charts/ecommerce-app/templates/service.yaml b/charts/ecommerce-app/templates/service.yaml
new file mode 100644
index 0000000..682a226
--- /dev/null
+++ b/charts/ecommerce-app/templates/service.yaml
@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: ecommerce-service
+spec:
+  type: ClusterIP
+  selector:
+    app: ecommerce-app
+  ports:
+    - port: 8080
+      targetPort: 8080
\ No newline at end of file
diff --git a/charts/ecommerce-app/values-prod.yaml b/charts/ecommerce-app/values-prod.yaml
new file mode 100644
index 0000000..5f592bf
--- /dev/null
+++ b/charts/ecommerce-app/values-prod.yaml
@@ -0,0 +1 @@
+replicaCount: 3
\ No newline at end of file
diff --git a/charts/ecommerce-app/values.yaml b/charts/ecommerce-app/values.yaml
new file mode 100644
index 0000000..6a1337b
--- /dev/null
+++ b/charts/ecommerce-app/values.yaml
@@ -0,0 +1,25 @@
+replicaCount: 2
+
+image:
+  repository: ghcr.io/jessfreak/ecommerce-app
+  tag: latest
+  pullPolicy: IfNotPresent
+
+resources:
+  limits:
+    cpu: 200m
+    memory: 256Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+
+postgres:
+  image: postgres:15-alpine
+  dbName: service_station
+  dbUser: postgres
+
+secrets:
+  dbPassword: "dummy-password"
+  jwtSecret: "dummy-secret"
+  googleClientId: "dummy-id"
+  googleClientSecret: "dummy-secret"
\ No newline at end of file
diff --git a/k8s/service.yaml b/k8s/service.yaml
index aa37cef..682a226 100644
--- a/k8s/service.yaml
+++ b/k8s/service.yaml
@@ -5,7 +5,7 @@ metadata:
 spec:
   type: ClusterIP
   selector:
-    app: backend-deployment
+    app: ecommerce-app
   ports:
     - port: 8080
       targetPort: 8080
\ No newline at end of file
diff --git a/tests/lab4_test.sh b/tests/lab4_test.sh
new file mode 100644
index 0000000..a2373f9
--- /dev/null
+++ b/tests/lab4_test.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+echo "--- Starting Lab 4 Grading (Helm Check) ---"
+
+# 1. Валідація чарта
+echo "Step 1: Running helm lint..."
+helm lint ./charts/ecommerce-app
+
+# 2. Перевірка шаблонізації для Prod
+echo "Step 2: Checking Production replica count..."
+REPLICAS=$(helm template ecommerce ./charts/ecommerce-app -f ./charts/ecommerce-app/values-prod.yaml | grep 'replicas: 3' | xargs)
+if [ "$REPLICAS" != "replicas: 3" ]; then
+  echo "❌ Error: values-prod.yaml should set replicas to 3."
+  exit 1
+fi
+
+# 3. Dry-run install
+echo "Step 3: Testing Dry-run installation..."
+helm install ecommerce ./charts/ecommerce-app --dry-run --debug
+
+echo "✅ SUCCESS: Lab 4 is passed!"
\ No newline at end of file