diff --git a/dev/breeze/src/airflow_breeze/utils/run_utils.py b/dev/breeze/src/airflow_breeze/utils/run_utils.py
index cfd9e9e179cf0..35052f44e07e7 100644
--- a/dev/breeze/src/airflow_breeze/utils/run_utils.py
+++ b/dev/breeze/src/airflow_breeze/utils/run_utils.py
@@ -412,13 +412,16 @@ def _run_compile_internally(
 
     env = os.environ.copy()
     if dev:
-        return run_command(
-            command_to_execute,
-            check=False,
-            no_output_dump_on_exception=True,
-            text=True,
-            env=env,
-        )
+        with open(UI_ASSET_OUT_DEV_MODE_FILE, "w") as output_file:
+            return run_command(
+                command_to_execute,
+                check=False,
+                no_output_dump_on_exception=True,
+                text=True,
+                env=env,
+                stderr=subprocess.STDOUT,
+                stdout=output_file,
+            )
     compile_lock.parent.mkdir(parents=True, exist_ok=True)
     compile_lock.unlink(missing_ok=True)
     try:
diff --git a/scripts/ci/prek/compile_ui_assets_dev.py b/scripts/ci/prek/compile_ui_assets_dev.py
index 8e98a0708f4a4..903e7f5e98d3e 100755
--- a/scripts/ci/prek/compile_ui_assets_dev.py
+++ b/scripts/ci/prek/compile_ui_assets_dev.py
@@ -18,6 +18,7 @@
 from __future__ import annotations
 
 import os
+import signal
 import subprocess
 import sys
 from pathlib import Path
@@ -79,10 +80,9 @@
             stderr=subprocess.STDOUT,
         )
 
-    subprocess.run(
+    subprocess.Popen(
         ["pnpm", "dev"],
         cwd=os.fspath(UI_DIRECTORY),
-        check=True,
         env=env,
         stdout=open(UI_ASSET_OUT_DEV_MODE_FILE, "a"),
         stderr=subprocess.STDOUT,
@@ -104,3 +104,7 @@
         stdout=open(SIMPLE_AUTH_MANAGER_UI_ASSET_OUT_DEV_MODE_FILE, "a"),
         stderr=subprocess.STDOUT,
     )
+
+    # Keep script alive so child processes stay in the same process group.
+    # When breeze exits, kill_process_group() will terminate all processes together.
+    signal.pause()