diff --git a/sample-code.js b/sample-code.js
new file mode 100644
index 0000000..add7930
--- /dev/null
+++ b/sample-code.js
@@ -0,0 +1,33 @@
+// Sample code with various issues for AI review
+function calculateTotal(items) {
+  let total = 0;
+  for (let i = 0; i < items.length; i++) {
+    total = total + items[i].price;
+  }
+  return total;
+}
+
+// Missing error handling
+function fetchUserData(userId) {
+  return fetch(`https://api.example.com/users/${userId}`)
+    .then(response => response.json());
+}
+
+// Security issue: SQL injection vulnerability
+function getUser(username) {
+  const query = "SELECT * FROM users WHERE username = '" + username + "'";
+  return db.query(query);
+}
+
+// Performance issue: inefficient loop
+function findDuplicates(arr) {
+  let duplicates = [];
+  for (let i = 0; i < arr.length; i++) {
+    for (let j = i + 1; j < arr.length; j++) {
+      if (arr[i] === arr[j]) {
+        duplicates.push(arr[i]);
+      }
+    }
+  }
+  return duplicates;
+}