diff --git a/airbyte-cdk/python/connector_builder/README.md b/airbyte-cdk/python/connector_builder/README.md
new file mode 100644
index 000000000000..f56a422b0e8a
--- /dev/null
+++ b/airbyte-cdk/python/connector_builder/README.md
@@ -0,0 +1,43 @@
+# Connector Builder Backend
+
+This is the backend for requests from the [Connector Builder](https://docs.airbyte.com/connector-development/config-based/connector-builder-ui/).
+
+## Local development
+
+### Locally running the Connector Builder backend
+
+```
+python main.py read --config path/to/config --catalog path/to/catalog
+```
+
+Note:
+- Requires the keys `__injected_declarative_manifest` and `__command` in its config, where `__injected_declarative_manifest` is a JSON manifest and `__command` is one of the commands handled by the ConnectorBuilderHandler (`stream_read`, `list_streams`, or `resolve_manifest`), i.e.
+```
+{
+  "config": <normal config>,
+  "__injected_declarative_manifest": {...},
+  "__command": <"resolve_manifest" | "list_streams" | "stream_read">
+}
+```
+*See [ConnectionSpecification](https://docs.airbyte.com/understanding-airbyte/airbyte-protocol/#actor-specification) for details on the `"config"` key if needed.
+
+- When the `__command` is `list_streams` or `resolve_manifest`, the argument to `catalog` should be an empty string.
+
+### Locally running the docker image
+
+#### Build
+
+First, make sure you build the latest Docker image:
+```
+./gradlew airbyte-cdk:python:airbyteDocker
+```
+
+The docker image name and tag, respectively, are the values of the `io.airbyte.name` and `io.airbyte.version` `LABEL`s in the Dockerfile.
+
+#### Run
+
+Then run any of the connector commands as follows:
+
+```
+docker run --rm -v $(pwd)/secrets:/secrets airbyte/source-declarative-manifest:dev read --config /secrets/config.json
+```
diff --git a/airbyte-cdk/python/connector_builder/__init__.py b/airbyte-cdk/python/connector_builder/__init__.py
new file mode 100644
index 000000000000..c941b3045795
--- /dev/null
+++ b/airbyte-cdk/python/connector_builder/__init__.py
@@ -0,0 +1,3 @@
+#
+# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+#
diff --git a/airbyte-cdk/python/connector_builder/connector_builder_handler.py b/airbyte-cdk/python/connector_builder/connector_builder_handler.py
new file mode 100644
index 000000000000..a3d3c65a8641
--- /dev/null
+++ b/airbyte-cdk/python/connector_builder/connector_builder_handler.py
@@ -0,0 +1,36 @@
+#
+# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+#
+
+from datetime import datetime
+
+from airbyte_cdk.models import AirbyteMessage, AirbyteRecordMessage, Type
+from airbyte_cdk.sources.declarative.manifest_declarative_source import ManifestDeclarativeSource
+from airbyte_cdk.utils.traced_exception import AirbyteTracedException
+
+
+def list_streams() -> AirbyteMessage:
+    raise NotImplementedError
+
+
+def stream_read() -> AirbyteMessage:
+    raise NotImplementedError
+
+
+def resolve_manifest(source: ManifestDeclarativeSource) -> AirbyteMessage:
+    try:
+        return AirbyteMessage(
+            type=Type.RECORD,
+            record=AirbyteRecordMessage(
+                data={"manifest": source.resolved_manifest},
+                emitted_at=_emitted_at(),
+                stream="resolve_manifest",
+            ),
+        )
+    except Exception as exc:
+        error = AirbyteTracedException.from_exception(exc, message="Error resolving manifest.")
+        return error.as_airbyte_message()
+
+
+def _emitted_at():
+    return int(datetime.now().timestamp()) * 1000
diff --git a/airbyte-cdk/python/connector_builder/main.py b/airbyte-cdk/python/connector_builder/main.py
new file mode 100644
index 000000000000..15ac5dcb8aa9
--- /dev/null
+++ b/airbyte-cdk/python/connector_builder/main.py
@@ -0,0 +1,52 @@
+#
+# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+#
+
+
+import sys
+from typing import Any, List, Mapping
+
+from airbyte_cdk.connector import BaseConnector
+from airbyte_cdk.entrypoint import AirbyteEntrypoint
+from airbyte_cdk.sources.declarative.manifest_declarative_source import ManifestDeclarativeSource
+from connector_builder.connector_builder_handler import resolve_manifest
+
+
+def create_source(config: Mapping[str, Any]) -> ManifestDeclarativeSource:
+    manifest = config.get("__injected_declarative_manifest")
+    return ManifestDeclarativeSource(manifest)
+
+
+def get_config_from_args(args: List[str]) -> Mapping[str, Any]:
+    parsed_args = AirbyteEntrypoint.parse_args(args)
+    if parsed_args.command != "read":
+        raise ValueError("Only read commands are allowed for Connector Builder requests.")
+
+    config = BaseConnector.read_config(parsed_args.config)
+
+    if "__injected_declarative_manifest" not in config:
+        raise ValueError(
+            f"Invalid config: `__injected_declarative_manifest` should be provided at the root of the config but config only has keys {list(config.keys())}"
+        )
+
+    return config
+
+
+def handle_connector_builder_request(source: ManifestDeclarativeSource, config: Mapping[str, Any]):
+    command = config.get("__command")
+    if command == "resolve_manifest":
+        return resolve_manifest(source)
+    raise ValueError(f"Unrecognized command {command}.")
+
+
+def handle_request(args: List[str]):
+    config = get_config_from_args(args)
+    source = create_source(config)
+    if "__command" in config:
+        print(handle_connector_builder_request(source, config))
+    else:
+        raise ValueError("Missing __command argument in config file.")
+
+
+if __name__ == "__main__":
+    handle_request(sys.argv[1:])
diff --git a/airbyte-cdk/python/unit_tests/connector_builder/__init__.py b/airbyte-cdk/python/unit_tests/connector_builder/__init__.py
new file mode 100644
index 000000000000..c941b3045795
--- /dev/null
+++ b/airbyte-cdk/python/unit_tests/connector_builder/__init__.py
@@ -0,0 +1,3 @@
+#
+# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+#
diff --git a/airbyte-cdk/python/unit_tests/connector_builder/test_connector_builder_handler.py b/airbyte-cdk/python/unit_tests/connector_builder/test_connector_builder_handler.py
new file mode 100644
index 000000000000..a2f2c81d89fa
--- /dev/null
+++ b/airbyte-cdk/python/unit_tests/connector_builder/test_connector_builder_handler.py
@@ -0,0 +1,247 @@
+#
+# Copyright (c) 2023 Airbyte, Inc., all rights reserved.
+#
+
+import copy
+import json
+from unittest import mock
+
+import connector_builder
+import pytest
+from airbyte_cdk.sources.declarative.manifest_declarative_source import ManifestDeclarativeSource
+from connector_builder.connector_builder_handler import resolve_manifest
+from connector_builder.main import handle_connector_builder_request, handle_request
+
+_stream_name = "stream_with_custom_requester"
+_stream_primary_key = "id"
+_stream_url_base = "https://api.sendgrid.com"
+_stream_options = {"name": _stream_name, "primary_key": _stream_primary_key, "url_base": _stream_url_base}
+
+MANIFEST = {
+    "version": "version",
+    "definitions": {
+        "schema_loader": {"name": "{{ options.stream_name }}", "file_path": "./source_sendgrid/schemas/{{ options.name }}.yaml"},
+        "retriever": {
+            "paginator": {
+                "type": "DefaultPaginator",
+                "page_size": 10,
+                "page_size_option": {"inject_into": "request_parameter", "field_name": "page_size"},
+                "page_token_option": {"inject_into": "path", "type": "RequestPath"},
+                "pagination_strategy": {"type": "CursorPagination", "cursor_value": "{{ response._metadata.next }}"},
+            },
+            "requester": {
+                "path": "/v3/marketing/lists",
+                "authenticator": {"type": "BearerAuthenticator", "api_token": "{{ config.apikey }}"},
+                "request_parameters": {"page_size": "10"},
+            },
+            "record_selector": {"extractor": {"field_path": ["result"]}},
+        },
+    },
+    "streams": [
+        {
+            "type": "DeclarativeStream",
+            "$parameters": _stream_options,
+            "schema_loader": {"$ref": "#/definitions/schema_loader"},
+            "retriever": "#/definitions/retriever",
+        },
+    ],
+    "check": {"type": "CheckStream", "stream_names": ["lists"]},
+}
+
+
+CONFIG = {
+    "__injected_declarative_manifest": MANIFEST,
+    "__command": "resolve_manifest",
+}
+
+
+@pytest.fixture
+def valid_config_file(tmp_path):
+    config_file = tmp_path / "config.json"
+    config_file.write_text(json.dumps(CONFIG))
+    return config_file
+
+
+@pytest.fixture
+def invalid_config_file(tmp_path):
+    invalid_config = copy.deepcopy(CONFIG)
+    invalid_config["__command"] = "bad_command"
+    config_file = tmp_path / "config.json"
+    config_file.write_text(json.dumps(invalid_config))
+    return config_file
+
+
+def test_handle_resolve_manifest(valid_config_file):
+    with mock.patch.object(connector_builder.main, "handle_connector_builder_request") as patch:
+        handle_request(["read", "--config", str(valid_config_file), "--catalog", ""])
+        assert patch.call_count == 1
+
+
+def test_resolve_manifest(valid_config_file):
+    config = copy.deepcopy(CONFIG)
+    config["__command"] = "resolve_manifest"
+    source = ManifestDeclarativeSource(MANIFEST)
+    resolved_manifest = handle_connector_builder_request(source, config)
+
+    expected_resolved_manifest = {
+        "type": "DeclarativeSource",
+        "version": "version",
+        "definitions": {
+            "schema_loader": {"name": "{{ options.stream_name }}", "file_path": "./source_sendgrid/schemas/{{ options.name }}.yaml"},
+            "retriever": {
+                "paginator": {
+                    "type": "DefaultPaginator",
+                    "page_size": 10,
+                    "page_size_option": {"inject_into": "request_parameter", "field_name": "page_size"},
+                    "page_token_option": {"inject_into": "path", "type": "RequestPath"},
+                    "pagination_strategy": {"type": "CursorPagination", "cursor_value": "{{ response._metadata.next }}"},
+                },
+                "requester": {
+                    "path": "/v3/marketing/lists",
+                    "authenticator": {"type": "BearerAuthenticator", "api_token": "{{ config.apikey }}"},
+                    "request_parameters": {"page_size": "10"},
+                },
+                "record_selector": {"extractor": {"field_path": ["result"]}},
+            },
+        },
+        "streams": [
+            {
+                "type": "DeclarativeStream",
+                "schema_loader": {
+                    "type": "JsonFileSchemaLoader",
+                    "name": "{{ options.stream_name }}",
+                    "file_path": "./source_sendgrid/schemas/{{ options.name }}.yaml",
+                    "primary_key": _stream_primary_key,
+                    "url_base": _stream_url_base,
+                    "$parameters": _stream_options,
+                },
+                "retriever": {
+                    "type": "SimpleRetriever",
+                    "paginator": {
+                        "type": "DefaultPaginator",
+                        "page_size": 10,
+                        "page_size_option": {
+                            "type": "RequestOption",
+                            "inject_into": "request_parameter",
+                            "field_name": "page_size",
+                            "name": _stream_name,
+                            "primary_key": _stream_primary_key,
+                            "url_base": _stream_url_base,
+                            "$parameters": _stream_options,
+                        },
+                        "page_token_option": {
+                            "type": "RequestPath",
+                            "inject_into": "path",
+                            "name": _stream_name,
+                            "primary_key": _stream_primary_key,
+                            "url_base": _stream_url_base,
+                            "$parameters": _stream_options,
+                        },
+                        "pagination_strategy": {
+                            "type": "CursorPagination",
+                            "cursor_value": "{{ response._metadata.next }}",
+                            "name": _stream_name,
+                            "primary_key": _stream_primary_key,
+                            "url_base": _stream_url_base,
+                            "$parameters": _stream_options,
+                        },
+                        "name": _stream_name,
+                        "primary_key": _stream_primary_key,
+                        "url_base": _stream_url_base,
+                        "$parameters": _stream_options,
+                    },
+                    "requester": {
+                        "type": "HttpRequester",
+                        "path": "/v3/marketing/lists",
+                        "authenticator": {
+                            "type": "BearerAuthenticator",
+                            "api_token": "{{ config.apikey }}",
+                            "name": _stream_name,
+                            "primary_key": _stream_primary_key,
+                            "url_base": _stream_url_base,
+                            "$parameters": _stream_options,
+                        },
+                        "request_parameters": {"page_size": "10"},
+                        "name": _stream_name,
+                        "primary_key": _stream_primary_key,
+                        "url_base": _stream_url_base,
+                        "$parameters": _stream_options,
+                    },
+                    "record_selector": {
+                        "type": "RecordSelector",
+                        "extractor": {
+                            "type": "DpathExtractor",
+                            "field_path": ["result"],
+                            "name": _stream_name,
+                            "primary_key": _stream_primary_key,
+                            "url_base": _stream_url_base,
+                            "$parameters": _stream_options,
+                        },
+                        "name": _stream_name,
+                        "primary_key": _stream_primary_key,
+                        "url_base": _stream_url_base,
+                        "$parameters": _stream_options,
+                    },
+                    "name": _stream_name,
+                    "primary_key": _stream_primary_key,
+                    "url_base": _stream_url_base,
+                    "$parameters": _stream_options,
+                },
+                "name": _stream_name,
+                "primary_key": _stream_primary_key,
+                "url_base": _stream_url_base,
+                "$parameters": _stream_options,
+            },
+        ],
+        "check": {"type": "CheckStream", "stream_names": ["lists"]},
+    }
+    assert resolved_manifest.record.data["manifest"] == expected_resolved_manifest
+    assert resolved_manifest.record.stream == "resolve_manifest"
+
+
+def test_resolve_manifest_error_returns_error_response():
+    class MockManifestDeclarativeSource:
+        @property
+        def resolved_manifest(self):
+            raise ValueError
+
+    source = MockManifestDeclarativeSource()
+    response = resolve_manifest(source)
+    assert "Error resolving manifest" in response.trace.error.message
+
+
+@pytest.mark.parametrize(
+    "command",
+    [
+        pytest.param("check", id="test_check_command_error"),
+        pytest.param("spec", id="test_spec_command_error"),
+        pytest.param("discover", id="test_discover_command_error"),
+        pytest.param(None, id="test_command_is_none_error"),
+        pytest.param("", id="test_command_is_empty_error"),
+    ],
+)
+def test_invalid_protocol_command(command, valid_config_file):
+    config = copy.deepcopy(CONFIG)
+    config["__command"] = "list_streams"
+    with pytest.raises(SystemExit):
+        handle_request([command, "--config", str(valid_config_file), "--catalog", ""])
+
+
+def test_missing_command(valid_config_file):
+    with pytest.raises(SystemExit):
+        handle_request(["--config", str(valid_config_file), "--catalog", ""])
+
+
+def test_missing_catalog(valid_config_file):
+    with pytest.raises(SystemExit):
+        handle_request(["read", "--config", str(valid_config_file)])
+
+
+def test_missing_config(valid_config_file):
+    with pytest.raises(SystemExit):
+        handle_request(["read", "--catalog", str(valid_config_file)])
+
+
+def test_invalid_config_command(invalid_config_file):
+    with pytest.raises(ValueError):
+        handle_request(["read", "--config", str(invalid_config_file), "--catalog", ""])
diff --git a/airbyte-cdk/python/unit_tests/test_source_declarative_manifest.py b/airbyte-cdk/python/unit_tests/test_source_declarative_manifest.py
index 63757dda03f5..aa762395f4dc 100644
--- a/airbyte-cdk/python/unit_tests/test_source_declarative_manifest.py
+++ b/airbyte-cdk/python/unit_tests/test_source_declarative_manifest.py
@@ -13,35 +13,11 @@
     "__injected_declarative_manifest": {
         "version": "0.1.0",
         "definitions": {
-            "selector": {
-                "extractor": {
-                    "field_path": []
-                }
-            },
-            "requester": {
-                "url_base": "https://test.com/api",
-                "http_method": "GET"
-            },
-            "retriever": {
-                "record_selector": {
-                    "$ref": "#/definitions/selector"
-                },
-                "requester": {
-                    "$ref": "#/definitions/requester"
-                }
-            },
-            "base_stream": {
-                "retriever": {
-                    "$ref": "#/definitions/retriever"
-                }
-            },
-            "data_stream": {
-                "$ref": "#/definitions/base_stream",
-                "$parameters": {
-                    "name": "data",
-                    "path": "/data"
-                }
-            },
+            "selector": {"extractor": {"field_path": []}},
+            "requester": {"url_base": "https://test.com/api", "http_method": "GET"},
+            "retriever": {"record_selector": {"$ref": "#/definitions/selector"}, "requester": {"$ref": "#/definitions/requester"}},
+            "base_stream": {"retriever": {"$ref": "#/definitions/retriever"}},
+            "data_stream": {"$ref": "#/definitions/base_stream", "$parameters": {"name": "data", "path": "/data"}},
         },
         "streams": [
             "#/definitions/data_stream",
@@ -59,9 +35,9 @@
                 "title": "Test Spec",
                 "type": "object",
                 "additionalProperties": True,
-                "properties": {}
-            }
-        }
+                "properties": {},
+            },
+        },
     }
 }