diff --git a/isce2_topsapp/iono_proc.py b/isce2_topsapp/iono_proc.py
index aaece72..13d082a 100644
--- a/isce2_topsapp/iono_proc.py
+++ b/isce2_topsapp/iono_proc.py
@@ -5,7 +5,6 @@
 import datetime
 import os
 import shutil
-import site
 from pathlib import Path
 from typing import Type, Union
 
diff --git a/isce2_topsapp/localize_dem.py b/isce2_topsapp/localize_dem.py
index f513f2f..25e0ddc 100644
--- a/isce2_topsapp/localize_dem.py
+++ b/isce2_topsapp/localize_dem.py
@@ -1,4 +1,3 @@
-import site
 import subprocess
 from pathlib import Path
 
@@ -28,7 +27,7 @@ def tag_dem_xml_as_ellipsoidal(dem_path: Path) -> str:
 
 
 def fix_image_xml(isce_raster_path: str) -> str:
-    fix_cmd = [f'fixImageXml.py',
+    fix_cmd = ['fixImageXml.py',
                '-i',
                str(isce_raster_path),
                '--full']
diff --git a/isce2_topsapp/packaging_utils/isce_functions.py b/isce2_topsapp/packaging_utils/isce_functions.py
index caec438..f3e4df7 100755
--- a/isce2_topsapp/packaging_utils/isce_functions.py
+++ b/isce2_topsapp/packaging_utils/isce_functions.py
@@ -5,7 +5,9 @@
 from __future__ import division
 from builtins import str
 from builtins import range
-from osgeo import gdal, ogr, osr
+from osgeo import gdal, ogr
+
+import isce
 
 
 def data_loading(filename,out_data_type=None,data_band=None):
@@ -209,11 +211,8 @@ def get_topsApp_data(topsapp_xml='topsApp'):
     '''
         loading the topsapp xml file
     '''
-
-    import isce
     from topsApp import TopsInSAR
     import os
-    import pdb
     # prvide the full path and strip off any .xml if pressent
     topsapp_xml = os.path.splitext(os.path.abspath(topsapp_xml))[0]
     curdir = os.getcwd()
@@ -228,7 +227,6 @@ def get_topsApp_data(topsapp_xml='topsApp'):
     return insar
 
 def get_isce_version_info(args):
-    import isce
     isce_version = isce.release_version
     if isce.release_svn_revision:
         isce_version = "ISCE version = " + isce_version + ", " + "SVN revision = " + isce.release_svn_revision
@@ -442,8 +440,6 @@ def check_file_exist(infile):
         raise Exception(infile + " does not exist")
 
 def read_isce_product(xmlfile):
-    import os
-    import isce
     from iscesys.Component.ProductManager import ProductManager as PM
 
     # check if the file does exist
@@ -622,6 +618,3 @@ def get_bbox(args):
     # return the polygon as a list of strings, which each poly a list argument
     geom_union_str = ["%s"%geom_union]
     return geom_union_str
-
-
-
diff --git a/isce2_topsapp/packaging_utils/makeGeocube.py b/isce2_topsapp/packaging_utils/makeGeocube.py
index d76e9a7..356cbd5 100644
--- a/isce2_topsapp/packaging_utils/makeGeocube.py
+++ b/isce2_topsapp/packaging_utils/makeGeocube.py
@@ -2,20 +2,16 @@
 from builtins import str
 from builtins import range
 from builtins import object
-import math
 import numpy as np
 import os
-import isce
 import argparse
 import h5py
-import datetime
 import pyproj
-import pdb
 import logging
 import shutil
 from time import time
 from functools import wraps
-from joblib import Parallel, delayed, dump, load
+from joblib import Parallel, delayed
 from pathlib import Path
 from pyproj import CRS
 
diff --git a/isce2_topsapp/packaging_utils/nc_packaging.py b/isce2_topsapp/packaging_utils/nc_packaging.py
index 1fa2a35..c990052 100755
--- a/isce2_topsapp/packaging_utils/nc_packaging.py
+++ b/isce2_topsapp/packaging_utils/nc_packaging.py
@@ -5,7 +5,6 @@
 from builtins import range
 from builtins import object
 import argparse
-import sys
 import json
 import logging
 import traceback
@@ -13,12 +12,9 @@
 import os
 from netCDF4 import Dataset
 import numpy as np
-import isce
-import osgeo
 from osgeo import gdal
 from osgeo import osr
 import collections.abc
-import pdb
 
 log_format = "[%(asctime)s: %(levelname)s/%(funcName)s] %(message)s"
 logging.basicConfig(format=log_format, level=logging.INFO)
diff --git a/isce2_topsapp/topsapp_proc.py b/isce2_topsapp/topsapp_proc.py
index eea1b45..33735bf 100644
--- a/isce2_topsapp/topsapp_proc.py
+++ b/isce2_topsapp/topsapp_proc.py
@@ -1,5 +1,3 @@
-import os
-import site
 import subprocess
 from pathlib import Path
 
@@ -99,9 +97,8 @@ def topsapp_processing(*,
     with open('topsApp.xml', "w") as file:
         file.write(topsApp_xml)
 
-    tops_app_cmd = f'{isce_application_path}/topsApp.py'
     for step in tqdm(TOPSAPP_STEPS, desc='TopsApp Steps'):
-        step_cmd = f'{tops_app_cmd} --dostep={step}'
+        step_cmd = f'topsApp.py --dostep={step}'
         result = subprocess.run(step_cmd,
                                 shell=True)
         if result.returncode != 0: