diff --git a/api/controllers/arithmeticController.js b/api/controllers/arithmeticController.js
index 0fccf513d7..b113a299ad 100644
--- a/api/controllers/arithmeticController.js
+++ b/api/controllers/arithmeticController.js
@@ -11,7 +11,8 @@ exports.calculate = function(req, res) {
   });
 
   var operations = {
-    'add':      function(a,b) { return +a + +b },
+    // Using + operator to type cast variables as integers in order to prevent string concatenation.
+    'add': function(a,b) { return +a + +b },
     'subtract': function(a,b) { return a - b },
     'multiply': function(a,b) { return a * b },
     'divide':   function(a,b) { return a / b },
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
new file mode 100644
index 0000000000..c55454d856
--- /dev/null
+++ b/azure-pipelines.yml
@@ -0,0 +1,22 @@
+# Node.js
+# Build a general Node.js project with npm.
+# Add steps that analyze code, save build artifacts, deploy, and more:
+# https://docs.microsoft.com/azure/devops/pipelines/languages/javascript
+
+trigger:
+- master
+
+pool:
+  vmImage: ubuntu-latest
+
+steps:
+- task: NodeTool@0
+  inputs:
+    versionSpec: '10.x'
+  displayName: 'Install Node.js'
+
+- script: |
+    npm install
+    npm run build
+    npm test
+  displayName: 'npm install, build, and test'