diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7d2b6491fb..b0232c10d9 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -383,6 +383,10 @@ jobs:
       - run:
           name: Run tests against the deployed apps
           command: ./aio/scripts/test-production.sh $CI_AIO_MIN_PWA_SCORE
+      - run:
+          name: Notify caretaker about failure
+          command: 'curl --request POST --header "Content-Type: application/json" --data "{\"text\":\":x: \`$CIRCLE_JOB\` job failed on build $CIRCLE_BUILD_NUM: $CIRCLE_BUILD_URL :scream:\"}" $CI_SECRET_SLACK_CARETAKER_WEBHOOK_URL'
+          when: on_fail
 
 workflows:
   version: 2
diff --git a/.circleci/env.sh b/.circleci/env.sh
index ebdd5c1542..9680eb6b1e 100755
--- a/.circleci/env.sh
+++ b/.circleci/env.sh
@@ -27,6 +27,8 @@ setPublicVar CI_REPO_OWNER "$CIRCLE_PROJECT_USERNAME";
 ####################################################################################################
 setSecretVar CI_SECRET_AIO_DEPLOY_FIREBASE_TOKEN "$AIO_DEPLOY_TOKEN";
 setSecretVar CI_SECRET_PAYLOAD_FIREBASE_TOKEN "$ANGULAR_PAYLOAD_TOKEN";
+# Defined in https://angular-team.slack.com/apps/A0F7VRE7N-circleci.
+setSecretVar CI_SECRET_SLACK_CARETAKER_WEBHOOK_URL "$SLACK_CARETAKER_WEBHOOK_URL";
 
 
 # Source `$BASH_ENV` to make the variables available immediately.