diff --git a/servicex_codegen/code_generator.py b/servicex_codegen/code_generator.py
index 5de07cc..753065c 100644
--- a/servicex_codegen/code_generator.py
+++ b/servicex_codegen/code_generator.py
@@ -1,4 +1,4 @@
-#  Copyright (c) 2022 , IRIS-HEP
+#  Copyright (c) 2022-2025, IRIS-HEP
 #   All rights reserved.
 #
 #   Redistribution and use in source and binary forms, with or without
@@ -32,9 +32,15 @@
 # modification, are permitted provided that the following conditions are met:
 #
 from abc import ABC, abstractmethod
-from collections import namedtuple
+from dataclasses import dataclass
+from typing import Optional
 
-GeneratedFileResult = namedtuple('GeneratedFileResult', 'hash output_dir')
+
+@dataclass
+class GeneratedFileResult:
+    hash: str
+    output_dir: str
+    image: Optional[str] = None
 
 
 class GenerateCodeException(BaseException):
@@ -47,5 +53,5 @@ def __init__(self, message: str):
 class CodeGenerator(ABC):
 
     @abstractmethod
-    def generate_code(self, query, cache_path: str):
+    def generate_code(self, query, cache_path: str) -> GeneratedFileResult:
         pass
diff --git a/servicex_codegen/post_operation.py b/servicex_codegen/post_operation.py
index 0d300dd..af9f399 100644
--- a/servicex_codegen/post_operation.py
+++ b/servicex_codegen/post_operation.py
@@ -1,4 +1,4 @@
-#  Copyright (c) 2022 , IRIS-HEP
+#  Copyright (c) 2022-2025, IRIS-HEP
 #   All rights reserved.
 #
 #   Redistribution and use in source and binary forms, with or without
@@ -97,7 +97,9 @@ def post(self):
                 zip_data = self.stream_generated_code(generated_code_result)
                 # code gen transformer returns the default transformer image mentioned in
                 # the config file
-                transformer_image = current_app.config['TRANSFORMER_SCIENCE_IMAGE']
+                transformer_image = (generated_code_result.image
+                                     if generated_code_result.image is not None
+                                     else current_app.config['TRANSFORMER_SCIENCE_IMAGE'])
 
                 # MultipartEncoder library takes multiple types of data fields and merge
                 # them into a multipart mime data type
diff --git a/tests/test_post_operation.py b/tests/test_post_operation.py
index 6869184..e413e2f 100644
--- a/tests/test_post_operation.py
+++ b/tests/test_post_operation.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019, IRIS-HEP
+# Copyright (c) 2019-2025, IRIS-HEP
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -76,6 +76,7 @@ def test_post_good_query_with_params(self, mocker):
 
             select_stmt = "(call ResultTTree (call Select (call SelectMany (call EventDataset (list 'localds://did_01')"  # noqa: E501
 
+            # Note we will ignore any image sent in the request!
             response = client.post("/servicex/generated-code", json={
                 "transformer_image": "sslhep/servicex_func_adl_xaod_transformer:develop",
                 "code": select_stmt
@@ -92,6 +93,7 @@ def test_post_good_query_with_params(self, mocker):
         print("Zip File: ", zip_file)
 
         assert response.status_code == 200
+        assert transformer_image == 'foo/bar:latest'
         check_zip_file(zip_file, 2)
         # Capture the temporary directory that was generated
         cache_dir = mock_ast_translator.generate_code.call_args[1]['cache_path']
@@ -137,6 +139,53 @@ def test_post_good_query_without_params(self, mocker):
             print("Zip File: ", zip_file)
 
         assert response.status_code == 200
+        assert transformer_image == 'sslhep/servicex_func_adl_xaod_transformer:develop'
+        check_zip_file(zip_file, 2)
+        # Capture the temporary directory that was generated
+        cache_dir = mock_ast_translator.generate_code.call_args[1]['cache_path']
+        mock_ast_translator.generate_code.assert_called_with(select_stmt,
+                                                             cache_path=cache_dir)
+
+    def test_post_good_query_with_params_and_image(self, mocker):
+        """Produce code for a simple good query"""
+
+        with TemporaryDirectory() as tempdir, \
+                open(os.path.join(tempdir, "baz.txt"), 'w'), \
+                open(os.path.join(tempdir, "foo.txt"), 'w'):
+
+            mock_ast_translator = mocker.Mock()
+            mock_ast_translator.generate_code = mocker.Mock(
+                return_value=GeneratedFileResult(hash="1234", output_dir=tempdir,
+                                                 image='sslhep/servicex_func_adl_xaod_transformer:develop')
+            )
+
+            config = {
+                'TARGET_BACKEND': 'uproot',
+                'TRANSFORMER_SCIENCE_IMAGE': "foo/bar:latest"
+            }
+            app = create_app(config, provided_translator=mock_ast_translator)
+            client = app.test_client()
+
+            print(app.config)
+
+            select_stmt = "(call ResultTTree (call Select (call SelectMany (call EventDataset (list 'localds://did_01')"  # noqa: E501
+
+            response = client.post("/servicex/generated-code", json={
+                "code": select_stmt
+            })
+
+        boundary = response.data[2:34].decode('utf-8')
+        content_type = f"multipart/form-data; boundary={boundary}"
+        decoder_parts = decoder.MultipartDecoder(response.data, content_type)
+
+        transformer_image = str(decoder_parts.parts[0].content, 'utf-8')
+        zip_file = decoder_parts.parts[3].content
+
+        print("Transformer Image: ", transformer_image)
+        print("Zip File: ", zip_file)
+
+        assert response.status_code == 200
+        assert transformer_image == 'sslhep/servicex_func_adl_xaod_transformer:develop'
         check_zip_file(zip_file, 2)
         # Capture the temporary directory that was generated
         cache_dir = mock_ast_translator.generate_code.call_args[1]['cache_path']