diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..8cd4c0c
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,40 @@
+version: 2.1
+
+workflows:
+  test:
+    jobs:
+      - build-run-linux:
+          context: hello-world-demos
+
+  test-daily:
+    triggers:
+    - schedule:
+        cron: "0 6 * * *"
+        filters:
+          branches:
+            only: main
+    jobs:
+    - build-run-linux:
+        context: hello-world-demos
+
+# This CI build ensures that the demo both compiles and works correctly. For the runtime test,
+# we use an SDK key and flag key that are passed in via the CircleCI project configuration;
+# the flag is configured to return a true value.
+
+jobs:
+  build-run-linux:
+    docker:
+      - image: circleci/node:latest
+    steps:
+      - checkout
+      - run:
+          name: insert SDK key and flag key into demo code
+          command: |
+            sed -i.bak "s/sdkKey *= *\".*\"/sdkKey = \"${LD_HELLO_WORLD_SDK_KEY}\"/" index.ts
+            sed -i.bak "s/featureFlagKey *= *\".*\"/featureFlagKey = \"${LD_HELLO_WORLD_FLAG_KEY_WITH_TRUE_VALUE}\"/" index.ts
+      - run: npm install
+      - run:
+          name: run demo
+          command: |
+            npm start | tee output.txt
+            grep "is true for this user" output.txt || (echo "Flag did not evaluate to expected true value" && exit 1)
diff --git a/.gitignore b/.gitignore
index b512c09..d5f19d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules
\ No newline at end of file
+node_modules
+package-lock.json
diff --git a/package.json b/package.json
index c0f7519..3f969cf 100644
--- a/package.json
+++ b/package.json
@@ -4,14 +4,12 @@
   "description": "Hello LaunchDarkly for Node.js with TypeScript",
   "main": "index.ts",
   "scripts": {
-    "start": "npm run build:live",
-    "build:live": "nodemon --exec ./node_modules/.bin/ts-node -- ./index.ts"
+    "start": "ts-node ./index.ts"
   },
   "author": "LaunchDarkly <team@launchdarkly.com>",
   "license": "Apache-2.0",
   "devDependencies": {
     "@types/node": "8.0.4",
-    "nodemon": "1.11.0",
     "ts-node": "3.1.0",
     "typescript": "2.4.1"
   },