diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..a2fc7ed
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,118 @@
+pipeline {
+    agent any
+
+    parameters {
+        string(name: 'HARBOR_REGISTRY',  defaultValue: 'harbor.example.com',  description: 'Harbor registry URL')
+        string(name: 'HARBOR_PROJECT',   defaultValue: 'inventory',            description: 'Harbor project name')
+        string(name: 'IMAGE_NAME',       defaultValue: 'backend',              description: 'Image name')
+        string(name: 'GIT_BRANCH',       defaultValue: 'main',                 description: 'Git branch to build')
+        string(name: 'ENVIRONMENT',      defaultValue: 'prod',                 description: 'Target environment (dev/staging/prod)')
+        booleanParam(name: 'SKIP_TESTS', defaultValue: false,                  description: 'Skip test execution')
+        booleanParam(name: 'AUTO_DEPLOY', defaultValue: true,                  description: 'Auto-sync ArgoCD after push')
+    }
+
+    environment {
+        SERVICE_NAME      = 'backend-service'
+        IMAGE_FULL_NAME   = "${params.HARBOR_REGISTRY}/${params.HARBOR_PROJECT}/${params.IMAGE_NAME}"
+        IMAGE_TAG         = "${params.GIT_BRANCH}-${env.BUILD_NUMBER}-${env.GIT_COMMIT?.take(7) ?: 'latest'}"
+        K8S_MANIFESTS_DIR = "${WORKSPACE}/k8s-manifests"
+        KUSTOMIZE_DIR     = "${K8S_MANIFESTS_DIR}/overlays/${params.ENVIRONMENT}"
+        HARBOR_CREDENTIALS  = credentials('harbor-credentials')
+        ARGOCD_CREDENTIALS  = credentials('argocd-credentials')
+        ARGOCD_SERVER     = 'argocd.example.com'
+        ARGOCD_APP_NAME   = 'inventory-app'
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+                script {
+                    env.GIT_COMMIT = sh(returnStdout: true, script: 'git rev-parse HEAD').trim()
+                    env.GIT_AUTHOR = sh(returnStdout: true, script: 'git log -1 --pretty=format:%an').trim()
+                    echo "Branch: ${params.GIT_BRANCH} | Commit: ${env.GIT_COMMIT} | Author: ${env.GIT_AUTHOR}"
+                }
+            }
+        }
+
+        stage('Test') {
+            when { expression { !params.SKIP_TESTS } }
+            steps {
+                dir("${WORKSPACE}/${SERVICE_NAME}") {
+                    sh 'npm ci && npm test'
+                }
+            }
+        }
+
+        stage('Build Image') {
+            steps {
+                dir("${WORKSPACE}/${SERVICE_NAME}") {
+                    sh """
+                        docker build \
+                            -t ${IMAGE_FULL_NAME}:${IMAGE_TAG} \
+                            -t ${IMAGE_FULL_NAME}:${params.GIT_BRANCH}-latest \
+                            --label git.commit=${env.GIT_COMMIT} \
+                            --label build.number=${env.BUILD_NUMBER} \
+                            --label service=${SERVICE_NAME} \
+                            .
+                    """
+                }
+            }
+        }
+
+        stage('Push to Harbor') {
+            steps {
+                sh """
+                    echo ${HARBOR_CREDENTIALS_PSW} | docker login ${params.HARBOR_REGISTRY} \
+                        -u ${HARBOR_CREDENTIALS_USR} --password-stdin
+                    docker push ${IMAGE_FULL_NAME}:${IMAGE_TAG}
+                    docker push ${IMAGE_FULL_NAME}:${params.GIT_BRANCH}-latest
+                    docker logout ${params.HARBOR_REGISTRY}
+                """
+            }
+        }
+
+        stage('Update Manifests') {
+            steps {
+                dir(KUSTOMIZE_DIR) {
+                    sh """
+                        command -v kustomize || (curl -s https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh | bash && sudo mv kustomize /usr/local/bin/)
+                        kustomize edit set image gitea.example.com/inventory/backend=${IMAGE_FULL_NAME}:${IMAGE_TAG}
+                    """
+                }
+                sh """
+                    cd ${K8S_MANIFESTS_DIR}
+                    git config user.email "jenkins@example.com"
+                    git config user.name "Jenkins Backend Pipeline"
+                    git add overlays/${params.ENVIRONMENT}/kustomization.yaml
+                    git commit -m "chore(backend): update image to ${IMAGE_TAG} [build=${env.BUILD_NUMBER}, env=${params.ENVIRONMENT}]" || true
+                    git push origin ${params.GIT_BRANCH}
+                """
+            }
+        }
+
+        stage('Deploy') {
+            when { expression { params.AUTO_DEPLOY } }
+            steps {
+                sh """
+                    command -v argocd || (curl -sSL -o /tmp/argocd https://github.com/argoproj/argo-cd/releases/latest/download/argocd-linux-amd64 && chmod +x /tmp/argocd)
+                    ARGOCD_CMD=\$(command -v argocd || echo /tmp/argocd)
+                    \$ARGOCD_CMD login ${ARGOCD_SERVER} --username ${ARGOCD_CREDENTIALS_USR} --password ${ARGOCD_CREDENTIALS_PSW} --insecure
+                    \$ARGOCD_CMD app sync ${ARGOCD_APP_NAME} --prune --timeout 300
+                    \$ARGOCD_CMD app wait ${ARGOCD_APP_NAME} --health --timeout 300
+                """
+            }
+        }
+    }
+
+    post {
+        always {
+            sh """
+                docker rmi ${IMAGE_FULL_NAME}:${IMAGE_TAG} || true
+                docker rmi ${IMAGE_FULL_NAME}:${params.GIT_BRANCH}-latest || true
+            """
+        }
+        success { echo "BUILD SUCCESS | ${SERVICE_NAME} | ${IMAGE_FULL_NAME}:${IMAGE_TAG} | build=${env.BUILD_NUMBER}" }
+        failure { echo "BUILD FAILED  | ${SERVICE_NAME} | build=${env.BUILD_NUMBER} | Check console output" }
+    }
+}
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