diff --git a/list_utils.py b/list_utils.py
new file mode 100644
index 0000000..c75d957
--- /dev/null
+++ b/list_utils.py
@@ -0,0 +1,12 @@
+from typing import Optional
+
+
+def find_max(numbers: list[int]) -> Optional[int]:
+    if not numbers:
+        return None
+    return max(numbers)
+
+
+def flatten(nested: list[list]) -> list:
+    return [item for sublist in nested for item in sublist]
+