diff --git a/iot/iot_devices/device_manager.py b/iot/iot_devices/device_manager.py
new file mode 100644
index 000000000..d0229cb53
--- /dev/null
+++ b/iot/iot_devices/device_manager.py
@@ -0,0 +1,43 @@
+import json
+import os
+from typing import List, Dict
+
+class DeviceManager:
+    def __init__(self, device_db_file: str = "device_db.json"):
+        self.device_db_file = device_db_file
+        self.device_db: Dict[str, dict] = self.load_device_db()
+
+    def load_device_db(self) -> Dict[str, dict]:
+        if os.path.exists(self.device_db_file):
+            with open(self.device_db_file, "r") as f:
+                return json.load(f)
+        else:
+            return {}
+
+    def save_device_db(self) -> None:
+        with open(self.device_db_file, "w") as f:
+            json.dump(self.device_db, f, indent=4)
+
+    def add_device(self, device_id: str, device_info: dict) -> None:
+        self.device_db[device_id] = device_info
+        self.save_device_db()
+
+    def get_device(self, device_id: str) -> dict:
+        return self.device_db.get(device_id)
+
+    def remove_device(self, device_id: str) -> None:
+        if device_id in self.device_db:
+            del self.device_db[device_id]
+            self.save_device_db()
+
+    def list_devices(self) -> List[str]:
+        return list(self.device_db.keys())
+
+# Example usage
+manager = DeviceManager()
+manager.add_device("device1", {"type": "temperature sensor", "location": "room 1"})
+manager.add_device("device2", {"type": "humidity sensor", "location": "room 2"})
+print(manager.list_devices())  # Output: ["device1", "device2"]
+print(manager.get_device("device1"))  # Output: {"type": "temperature sensor", "location": "room 1"}
+manager.remove_device("device1")
+print(manager.list_devices())  # Output: ["device2"]