diff --git a/app/app.py b/app/app.py
new file mode 100644
index 0000000..7a6b545
--- /dev/null
+++ b/app/app.py
@@ -0,0 +1,88 @@
+import asyncio
+from pathlib import Path
+
+import aiohttp
+from watchfiles import Change, awatch
+
+local_root = "."
+remote_root = f"http://127.0.0.1:8090/"
+
+
+async def main():
+    async for changes in awatch(local_root):
+        for change_type, filepath in changes:
+            await process_change(change_type, filepath)
+
+
+async def process_change(change_type, filepath):
+    if change_type == Change.added:
+        await process_change_added(filepath)
+    elif change_type == Change.modified:
+        await process_change_modified(filepath)
+    elif change_type == Change.deleted:
+        await process_change_deleted(filepath)
+    else:
+        raise "Unexpected change type"
+
+
+def make_relative_path(root, target):
+    root = Path(root).resolve()
+    target = Path(target).resolve()
+    return str(target.relative_to(root))
+
+
+def endpoint_from_local_path(local_target):
+    relative_path = make_relative_path(local_root, local_target)
+    remote_target = remote_root + relative_path
+
+    assert remote_target[-1] != "/"
+    if Path(local_target).is_dir():
+        remote_target += "/"
+
+    return remote_target
+
+
+async def process_change_added(local_target):
+    async with aiohttp.ClientSession() as session:
+        # Determine the endpoint the file should be
+        # uploaded to.
+        remote_target = endpoint_from_local_path(local_target)
+
+        # Read its contents
+        with open(local_target, "rb") as f:
+            data = f.read()
+
+        # Upload
+        async with session.put(remote_target, data=data) as response:
+            pass  # TODO
+
+
+async def process_change_modified(local_target):
+    async with aiohttp.ClientSession() as session:
+        # Determine the endpoint the file should be
+        # uploaded to.
+        remote_target = endpoint_from_local_path(local_target)
+
+        # Read its contents
+        with open(local_target, "rb") as f:
+            data = f.read()
+
+        # Upload
+        async with session.put(remote_target, data=data) as response:
+            pass  # TODO
+
+
+async def process_change_deleted(local_target):
+    async with aiohttp.ClientSession() as session:
+        # Determine the endpoint that should be deleted
+        remote_target = endpoint_from_local_path(local_target)
+
+        # Delete
+        async with session.delete(remote_target) as response:
+            pass  # TODO
+
+
+try:
+    asyncio.run(main())
+except KeyboardInterrupt:
+    pass