From 677481c79634c3c065fcb2bc3a6d8357d282c817 Mon Sep 17 00:00:00 2001
From: Vinay Narahari <narahavi@amazon.com>
Date: Mon, 1 Jun 2026 10:42:15 -0400
Subject: [PATCH 1/2] Add aws-cpp-sdk-s3-transfer package scaffolding for
 Transfer Manager 2.0

---
 cmake/sdks.cmake                              |  2 +-
 cmake/sdksCommon.cmake                        |  2 +
 src/aws-cpp-sdk-s3-transfer/CMakeLists.txt    | 53 +++++++++++++++++++
 .../include/aws/s3-transfer/DownloadRequest.h | 18 +++++++
 .../aws/s3-transfer/DownloadResponse.h        | 18 +++++++
 .../aws/s3-transfer/ProgressListener.h        | 18 +++++++
 .../aws/s3-transfer/ProgressSnapshot.h        | 18 +++++++
 .../aws/s3-transfer/S3TransferManager.h       | 18 +++++++
 .../S3TransferManagerConfiguration.h          | 18 +++++++
 .../aws/s3-transfer/S3Transfer_EXPORTS.h      | 28 ++++++++++
 .../include/aws/s3-transfer/UploadRequest.h   | 18 +++++++
 .../include/aws/s3-transfer/UploadResponse.h  | 18 +++++++
 .../source/s3-transfer/S3TransferManager.cpp  | 15 ++++++
 13 files changed, 243 insertions(+), 1 deletion(-)
 create mode 100644 src/aws-cpp-sdk-s3-transfer/CMakeLists.txt
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManagerConfiguration.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3Transfer_EXPORTS.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp

diff --git a/cmake/sdks.cmake b/cmake/sdks.cmake
index 28c0db501f06..4182fcc0f661 100644
--- a/cmake/sdks.cmake
+++ b/cmake/sdks.cmake
@@ -2,7 +2,7 @@ include(sdksCommon)
 
 set(SDK_DEPENDENCY_BUILD_LIST "")
 
-set(NON_GENERATED_CLIENT_LIST access-management text-to-speech core queues s3-encryption identity-management transfer)  ## Manually generated code with a name mimicking client name
+set(NON_GENERATED_CLIENT_LIST access-management text-to-speech core queues s3-encryption identity-management transfer s3-transfer)  ## Manually generated code with a name mimicking client name
 
 if(REGENERATE_CLIENTS OR REGENERATE_DEFAULTS)
     message(STATUS "Checking for SDK generation requirements")
diff --git a/cmake/sdksCommon.cmake b/cmake/sdksCommon.cmake
index a0220c83188f..fc3bcc180234 100644
--- a/cmake/sdksCommon.cmake
+++ b/cmake/sdksCommon.cmake
@@ -80,6 +80,7 @@ list(APPEND HIGH_LEVEL_SDK_LIST "access-management")
 list(APPEND HIGH_LEVEL_SDK_LIST "identity-management")
 list(APPEND HIGH_LEVEL_SDK_LIST "queues")
 list(APPEND HIGH_LEVEL_SDK_LIST "transfer")
+list(APPEND HIGH_LEVEL_SDK_LIST "s3-transfer")
 list(APPEND HIGH_LEVEL_SDK_LIST "s3-encryption")
 list(APPEND HIGH_LEVEL_SDK_LIST "text-to-speech")
 
@@ -141,6 +142,7 @@ list(APPEND SDK_DEPENDENCY_LIST "queues:sqs,core")
 list(APPEND SDK_DEPENDENCY_LIST "s3-encryption:s3,kms,core")
 list(APPEND SDK_DEPENDENCY_LIST "text-to-speech:polly,core")
 list(APPEND SDK_DEPENDENCY_LIST "transfer:s3,core")
+list(APPEND SDK_DEPENDENCY_LIST "s3-transfer:s3,core")
 
 set(TEST_DEPENDENCY_LIST "")
 list(APPEND TEST_DEPENDENCY_LIST "cognito-identity:access-management,iam,core")
diff --git a/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt b/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt
new file mode 100644
index 000000000000..b4c19b6d5b2a
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt
@@ -0,0 +1,53 @@
+add_project(aws-cpp-sdk-s3-transfer
+        "High-level CRT-backed C++ SDK for file transfer to/from AWS S3"
+        aws-cpp-sdk-s3
+        aws-cpp-sdk-core)
+
+file( GLOB S3_TRANSFER_HEADERS "include/aws/s3-transfer/*.h" )
+
+file( GLOB S3_TRANSFER_SOURCE "source/s3-transfer/*.cpp" )
+
+if(MSVC)
+    source_group("Header Files\\aws\\s3-transfer" FILES ${S3_TRANSFER_HEADERS})
+    source_group("Source Files\\s3-transfer" FILES ${S3_TRANSFER_SOURCE})
+endif()
+
+file(GLOB ALL_S3_TRANSFER_HEADERS
+        ${S3_TRANSFER_HEADERS}
+)
+
+file(GLOB ALL_S3_TRANSFER_SOURCE
+        ${S3_TRANSFER_SOURCE}
+)
+
+file(GLOB ALL_S3_TRANSFER
+        ${ALL_S3_TRANSFER_HEADERS}
+        ${ALL_S3_TRANSFER_SOURCE}
+)
+
+set(S3_TRANSFER_INCLUDES
+        "${CMAKE_CURRENT_SOURCE_DIR}/include/"
+)
+
+include_directories(${S3_TRANSFER_INCLUDES})
+
+if(USE_WINDOWS_DLL_SEMANTICS AND BUILD_SHARED_LIBS)
+    add_definitions("-DAWS_S3_TRANSFER_EXPORTS")
+endif()
+
+add_library(${PROJECT_NAME} ${ALL_S3_TRANSFER})
+add_library(AWS::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
+
+target_include_directories(${PROJECT_NAME} PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:include>)
+target_link_libraries(${PROJECT_NAME} PRIVATE ${PLATFORM_DEP_LIBS} ${PROJECT_LIBS})
+
+set_compiler_flags(${PROJECT_NAME})
+set_compiler_warnings(${PROJECT_NAME})
+
+setup_install()
+
+install (FILES ${ALL_S3_TRANSFER_HEADERS} DESTINATION ${INCLUDE_DIRECTORY}/aws/s3-transfer)
+
+do_packaging()
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h
new file mode 100644
index 000000000000..15d6e4e2bece
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API DownloadRequest {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h
new file mode 100644
index 000000000000..7afd22a1b130
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API DownloadResponse {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h
new file mode 100644
index 000000000000..827edfdd5b09
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API ProgressListener {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h
new file mode 100644
index 000000000000..699c89d5a571
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API ProgressSnapshot {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h
new file mode 100644
index 000000000000..27a5e703bea0
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API S3TransferManager {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManagerConfiguration.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManagerConfiguration.h
new file mode 100644
index 000000000000..bb80deb4686e
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManagerConfiguration.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API S3TransferManagerConfiguration {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3Transfer_EXPORTS.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3Transfer_EXPORTS.h
new file mode 100644
index 000000000000..fe7636bb9067
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3Transfer_EXPORTS.h
@@ -0,0 +1,28 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+
+#ifdef _MSC_VER
+    //disable windows complaining about max template size.
+    #pragma warning (disable : 4503)
+#endif
+
+#if defined (USE_WINDOWS_DLL_SEMANTICS) || defined (_WIN32)
+    #ifdef _MSC_VER
+        #pragma warning(disable : 4251)
+    #endif // _MSC_VER
+
+    #ifdef USE_IMPORT_EXPORT
+      #ifdef AWS_S3_TRANSFER_EXPORTS
+        #define AWS_S3_TRANSFER_API __declspec(dllexport)
+      #else
+        #define AWS_S3_TRANSFER_API __declspec(dllimport)
+      #endif // AWS_S3_TRANSFER_EXPORTS
+    #else // USE_IMPORT_EXPORT
+       #define AWS_S3_TRANSFER_API
+    #endif // USE_IMPORT_EXPORT
+#else // defined (USE_WINDOWS_DLL_SEMANTICS) || defined (_WIN32)
+    #define AWS_S3_TRANSFER_API
+#endif // defined (USE_WINDOWS_DLL_SEMANTICS) || defined (_WIN32)
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h
new file mode 100644
index 000000000000..56bba8475ce3
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API UploadResponse {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h
new file mode 100644
index 000000000000..56bba8475ce3
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h
@@ -0,0 +1,18 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+
+namespace Aws {
+  namespace S3 {
+    namespace Transfer {
+      class AWS_S3_TRANSFER_API UploadResponse {
+        //need to fill in class defintion later
+      };
+    }
+  }
+}
+
diff --git a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp
new file mode 100644
index 000000000000..992407a5caf3
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp
@@ -0,0 +1,15 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+* SPDX-License-Identifier: Apache-2.0.
+*/
+
+#include <aws/s3-transfer/S3TransferManager.h>
+
+
+namespace Aws {
+  namespace S3{
+    namespace Transfer {
+
+    }
+  }
+}

From 3dd9f19dc8c39bbd20a60a954be7519660497bed Mon Sep 17 00:00:00 2001
From: Vinay Narahari <narahavi@amazon.com>
Date: Wed, 10 Jun 2026 10:47:26 -0400
Subject: [PATCH 2/2] Add SEP-required public API types for Transfer Manager
 2.0

---
 src/aws-cpp-sdk-s3-transfer/CMakeLists.txt    | 10 +-
 .../include/aws/s3-transfer/DownloadHandle.h  | 44 +++++++++
 .../s3-transfer/DownloadProgressListener.h    | 48 ++++++++++
 .../s3-transfer/DownloadProgressSnapshot.h    | 47 ++++++++++
 .../include/aws/s3-transfer/DownloadRequest.h | 94 +++++++++++++++++--
 .../aws/s3-transfer/DownloadResponse.h        | 41 ++++++--
 .../aws/s3-transfer/ProgressListener.h        | 18 ----
 .../aws/s3-transfer/ProgressSnapshot.h        | 18 ----
 .../aws/s3-transfer/S3TransferManager.h       | 57 +++++++++--
 .../include/aws/s3-transfer/UploadHandle.h    | 44 +++++++++
 .../aws/s3-transfer/UploadProgressListener.h  | 48 ++++++++++
 .../aws/s3-transfer/UploadProgressSnapshot.h  | 46 +++++++++
 .../include/aws/s3-transfer/UploadRequest.h   | 94 +++++++++++++++++--
 .../include/aws/s3-transfer/UploadResponse.h  | 41 ++++++--
 .../source/s3-transfer/DownloadHandle.cpp     | 23 +++++
 .../source/s3-transfer/S3TransferManager.cpp  | 32 +++++--
 .../source/s3-transfer/UploadHandle.cpp       | 23 +++++
 .../s3-transfer/internal/CrtOperations.cpp    |  5 +
 .../s3-transfer/internal/CrtOperations.h      | 10 ++
 19 files changed, 654 insertions(+), 89 deletions(-)
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadHandle.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressListener.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressSnapshot.h
 delete mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h
 delete mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadHandle.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressListener.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressSnapshot.h
 create mode 100644 src/aws-cpp-sdk-s3-transfer/source/s3-transfer/DownloadHandle.cpp
 create mode 100644 src/aws-cpp-sdk-s3-transfer/source/s3-transfer/UploadHandle.cpp
 create mode 100644 src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.cpp
 create mode 100644 src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.h

diff --git a/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt b/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt
index b4c19b6d5b2a..1dc3248f857e 100644
--- a/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt
+++ b/src/aws-cpp-sdk-s3-transfer/CMakeLists.txt
@@ -7,17 +7,24 @@ file( GLOB S3_TRANSFER_HEADERS "include/aws/s3-transfer/*.h" )
 
 file( GLOB S3_TRANSFER_SOURCE "source/s3-transfer/*.cpp" )
 
+file( GLOB S3_TRANSFER_INTERNAL_HEADERS "include/aws/s3-transfer/internal/*.h" )
+file( GLOB S3_TRANSFER_INTERNAL_SOURCE "source/s3-transfer/internal/*.cpp" )
+
 if(MSVC)
     source_group("Header Files\\aws\\s3-transfer" FILES ${S3_TRANSFER_HEADERS})
     source_group("Source Files\\s3-transfer" FILES ${S3_TRANSFER_SOURCE})
+    source_group("Header Files\\aws\\s3-transfer\\internal" FILES ${S3_TRANSFER_INTERNAL_HEADERS})
+    source_group("Source Files\\s3-transfer\\internal" FILES ${S3_TRANSFER_INTERNAL_SOURCE})
 endif()
 
 file(GLOB ALL_S3_TRANSFER_HEADERS
         ${S3_TRANSFER_HEADERS}
+        ${S3_TRANSFER_INTERNAL_HEADERS}
 )
 
 file(GLOB ALL_S3_TRANSFER_SOURCE
         ${S3_TRANSFER_SOURCE}
+        ${S3_TRANSFER_INTERNAL_SOURCE}
 )
 
 file(GLOB ALL_S3_TRANSFER
@@ -48,6 +55,7 @@ set_compiler_warnings(${PROJECT_NAME})
 
 setup_install()
 
-install (FILES ${ALL_S3_TRANSFER_HEADERS} DESTINATION ${INCLUDE_DIRECTORY}/aws/s3-transfer)
+install (FILES ${S3_TRANSFER_HEADERS}          DESTINATION ${INCLUDE_DIRECTORY}/aws/s3-transfer)
+install (FILES ${S3_TRANSFER_INTERNAL_HEADERS} DESTINATION ${INCLUDE_DIRECTORY}/aws/s3-transfer/internal)
 
 do_packaging()
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadHandle.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadHandle.h
new file mode 100644
index 000000000000..2ab3c3046f35
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadHandle.h
@@ -0,0 +1,44 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+#include <future>
+#include <memory>
+#include <aws/s3-transfer/DownloadResponse.h>
+
+
+namespace Aws {
+namespace S3 {
+namespace Transfer {
+
+class DownloadHandleImpl;
+
+/**
+ * Returned from S3TransferManager::Download to represent a single in-flight download. The
+ * handle is freely copyable; all copies share the same underlying transfer state.
+ */
+class AWS_S3_TRANSFER_API DownloadHandle {
+public:
+  ~DownloadHandle();
+
+  /**
+   * Returns a future that resolves once the transfer finishes, succeeds, or fails.
+   */
+  std::shared_future<DownloadResponse> CompletionFuture() const;
+
+  /**
+   * Requests cancellation of the in-flight download. Returns immediately; the future
+   * returned by CompletionFuture will resolve with a failure once the cancel takes effect.
+   */
+  void Cancel();
+
+private:
+  std::shared_ptr<DownloadHandleImpl> m_impl;
+};
+
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressListener.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressListener.h
new file mode 100644
index 000000000000..5200d84a5ab8
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressListener.h
@@ -0,0 +1,48 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+namespace Aws {
+namespace S3 {
+namespace Transfer {
+
+class DownloadRequest;
+class DownloadProgressSnapshot;
+
+/**
+ * Callback interface for receiving event-driven updates throughout the lifecycle of a download.
+ * Subclass and override the events of interest; default implementations are empty so unused
+ * callbacks can be ignored. Listeners may be registered on the request or on the manager.
+ */
+class AWS_S3_TRANSFER_API DownloadProgressListener {
+ public:
+  virtual ~DownloadProgressListener() = default;
+
+  /**
+   * Invoked exactly once when the download begins, before any bytes have been transferred.
+   */
+  virtual void OnTransferInitiated(const DownloadRequest&, const DownloadProgressSnapshot&) {}
+
+  /**
+   * Invoked as bytes are received from S3. Called at least once for a successful transfer
+   * and may be called many times depending on object size and I/O buffer sizes.
+   */
+  virtual void OnBytesTransferred(const DownloadRequest&, const DownloadProgressSnapshot&) {}
+
+  /**
+   * Invoked exactly once when the download completes successfully.
+   */
+  virtual void OnTransferComplete(const DownloadRequest&, const DownloadProgressSnapshot&) {}
+
+  /**
+   * Invoked exactly once when the download fails or is cancelled.
+   */
+  virtual void OnTransferFailed(const DownloadRequest&, const DownloadProgressSnapshot&) {}
+};
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressSnapshot.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressSnapshot.h
new file mode 100644
index 000000000000..6d3647b7062f
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadProgressSnapshot.h
@@ -0,0 +1,47 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+#include <aws/s3-transfer/DownloadResponse.h>
+#include <cstdint>
+#include <memory>
+#include <utility>
+
+namespace Aws {
+namespace S3 {
+namespace Transfer {
+
+/**
+ * Immutable snapshot of download progress passed to DownloadProgressListener callbacks.
+ * Captures bytes transferred, total bytes (known after the GetObject response is received),
+ * and the response once available.
+ */
+class AWS_S3_TRANSFER_API DownloadProgressSnapshot {
+ public:
+  DownloadProgressSnapshot(uint64_t transferredBytes,
+                           uint64_t totalBytes,
+                           std::shared_ptr<DownloadResponse> response,
+                           bool totalBytesHasBeenSet)
+      : m_transferredBytes(transferredBytes),
+        m_totalBytes(totalBytes),
+        m_response(std::move(response)),
+        m_totalBytesHasBeenSet(totalBytesHasBeenSet) {}
+
+  inline uint64_t GetTransferredBytes() const { return m_transferredBytes; }
+  inline uint64_t GetTotalBytes() const { return m_totalBytes; }
+  inline bool TotalBytesHasBeenSet() const { return m_totalBytesHasBeenSet; }
+  inline const std::shared_ptr<DownloadResponse>& GetResponse() const { return m_response; }
+  inline bool ResponseHasBeenSet() const { return m_response != nullptr; }
+
+ private:
+  uint64_t m_transferredBytes = 0;
+  uint64_t m_totalBytes = 0;
+  std::shared_ptr<DownloadResponse> m_response;
+  bool m_totalBytesHasBeenSet = false;
+};
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h
index 15d6e4e2bece..9b2f1b05e78e 100644
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadRequest.h
@@ -1,18 +1,94 @@
 /**
-* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0.
  */
 #pragma once
 #include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
+#include <aws/s3-transfer/DownloadProgressListener.h>
+#include <aws/core/utils/memory/stl/AWSString.h>
+#include <aws/core/utils/memory/stl/AWSVector.h>
+#include <aws/core/utils/stream/ResponseStream.h>
+#include <aws/s3/model/GetObjectRequest.h>
+#include <memory>
+#include <utility>
 
 namespace Aws {
-  namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API DownloadRequest {
-        //need to fill in class defintion later
-      };
-    }
+namespace S3 {
+namespace Transfer {
+
+/**
+ * Request type for S3TransferManager::Download. Carries the inner S3 GetObjectRequest along
+ * with the local destination (file path or stream factory) and any request-level progress
+ * listeners. The transfer manager parallelizes large objects via ranged GETs internally.
+ */
+class AWS_S3_TRANSFER_API DownloadRequest {
+ public:
+  inline const Aws::S3::Model::GetObjectRequest& GetS3Request() const { return m_s3Request; }
+  inline bool S3RequestHasBeenSet() const { return m_s3RequestHasBeenSet; }
+  template <typename S3RequestT = Aws::S3::Model::GetObjectRequest>
+  void SetS3Request(S3RequestT&& val) {
+    m_s3RequestHasBeenSet = true;
+    m_s3Request = std::forward<S3RequestT>(val);
+  }
+  template <typename S3RequestT = Aws::S3::Model::GetObjectRequest>
+  DownloadRequest& WithS3Request(S3RequestT&& value) {
+    SetS3Request(std::forward<S3RequestT>(value));
+    return *this;
   }
-}
 
+  inline const Aws::String& GetDestinationFilePath() const { return m_destinationFilePath; }
+  inline bool DestinationFilePathHasBeenSet() const { return m_destinationFilePathHasBeenSet; }
+  template <typename DestinationFilePathT = Aws::String>
+  void SetDestinationFilePath(DestinationFilePathT&& value) {
+    m_destinationFilePathHasBeenSet = true;
+    m_destinationFilePath = std::forward<DestinationFilePathT>(value);
+  }
+  template <typename DestinationFilePathT = Aws::String>
+  DownloadRequest& WithDestinationFilePath(DestinationFilePathT&& value) {
+    SetDestinationFilePath(std::forward<DestinationFilePathT>(value));
+    return *this;
+  }
+
+  inline const Aws::IOStreamFactory& GetBody() const { return m_body; }
+  inline bool BodyHasBeenSet() const { return m_bodyHasBeenSet; }
+  inline void SetBody(const Aws::IOStreamFactory& val) {
+    m_bodyHasBeenSet = true;
+    m_body = val;
+  }
+  inline DownloadRequest& WithBody(const Aws::IOStreamFactory& val) {
+    SetBody(val);
+    return *this;
+  }
+
+  inline const Aws::Vector<std::shared_ptr<DownloadProgressListener>>& GetTransferListeners() const {
+    return m_transferListeners;
+  }
+  inline bool TransferListenersHasBeenSet() const { return m_transferListenersHasBeenSet; }
+  inline void SetTransferListeners(const Aws::Vector<std::shared_ptr<DownloadProgressListener>>& val) {
+    m_transferListenersHasBeenSet = true;
+    m_transferListeners = val;
+  }
+  inline DownloadRequest& WithTransferListeners(const Aws::Vector<std::shared_ptr<DownloadProgressListener>>& val) {
+    SetTransferListeners(val);
+    return *this;
+  }
+  inline DownloadRequest& AddTransferListener(const std::shared_ptr<DownloadProgressListener>& listener) {
+    m_transferListenersHasBeenSet = true;
+    m_transferListeners.push_back(listener);
+    return *this;
+  }
+
+ private:
+  Aws::S3::Model::GetObjectRequest m_s3Request;
+  Aws::String m_destinationFilePath;
+  Aws::IOStreamFactory m_body;
+  Aws::Vector<std::shared_ptr<DownloadProgressListener>> m_transferListeners;
+  bool m_s3RequestHasBeenSet = false;
+  bool m_destinationFilePathHasBeenSet = false;
+  bool m_bodyHasBeenSet = false;
+  bool m_transferListenersHasBeenSet = false;
+};
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h
index 7afd22a1b130..0ed0423527a4 100644
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/DownloadResponse.h
@@ -1,18 +1,41 @@
 /**
-* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0.
  */
 #pragma once
 #include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
+#include <aws/s3/model/GetObjectResult.h>
+#include <utility>
 
 namespace Aws {
-  namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API DownloadResponse {
-        //need to fill in class defintion later
-      };
-    }
+namespace S3 {
+namespace Transfer {
+
+/**
+ * Response type returned via the DownloadHandle's future once the transfer completes. Wraps
+ * the underlying S3 GetObjectResult with whole-object content length and range, regardless
+ * of how many ranged GETs were issued internally.
+ */
+class AWS_S3_TRANSFER_API DownloadResponse {
+ public:
+  inline const Aws::S3::Model::GetObjectResult& GetS3Result() const { return m_s3Result; }
+  inline bool S3ResultHasBeenSet() const { return m_s3ResultHasBeenSet; }
+  template <typename GetObjectResultT = Aws::S3::Model::GetObjectResult>
+  void SetS3Result(GetObjectResultT&& getS3Result) {
+    m_s3ResultHasBeenSet = true;
+    m_s3Result = std::forward<GetObjectResultT>(getS3Result);
   }
-}
+  template <typename GetObjectResultT = Aws::S3::Model::GetObjectResult>
+  DownloadResponse& WithS3Result(GetObjectResultT&& getS3Result) {
+    SetS3Result(std::forward<GetObjectResultT>(getS3Result));
+    return *this;
+  }
+
+ private:
+  Aws::S3::Model::GetObjectResult m_s3Result;
+  bool m_s3ResultHasBeenSet = false;
+};
 
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h
deleted file mode 100644
index 827edfdd5b09..000000000000
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressListener.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/**
-* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0.
- */
-#pragma once
-#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
-
-namespace Aws {
-  namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API ProgressListener {
-        //need to fill in class defintion later
-      };
-    }
-  }
-}
-
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h
deleted file mode 100644
index 699c89d5a571..000000000000
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/ProgressSnapshot.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/**
-* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0.
- */
-#pragma once
-#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
-
-namespace Aws {
-  namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API ProgressSnapshot {
-        //need to fill in class defintion later
-      };
-    }
-  }
-}
-
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h
index 27a5e703bea0..404575fdbf77 100644
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/S3TransferManager.h
@@ -4,15 +4,56 @@
  */
 #pragma once
 #include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
-
+#include <aws/s3-transfer/S3TransferManagerConfiguration.h>
+#include <aws/s3-transfer/UploadRequest.h>
+#include <aws/s3-transfer/DownloadRequest.h>
+#include <aws/s3-transfer/UploadHandle.h>
+#include <aws/s3-transfer/DownloadHandle.h>
+#include <aws/core/utils/memory/AWSMemory.h>
 namespace Aws {
   namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API S3TransferManager {
-        //need to fill in class defintion later
-      };
-    }
+  namespace Transfer {
+  class S3TransferManagerImpl;
+
+  /**
+   * High-level S3 transfer client backed by the AWS Common Runtime. Performs single-file
+   * uploads and downloads, automatically using multipart transfers for objects larger than
+   * the configured threshold. Customers hold an instance via shared_ptr; the manager owns
+   * the underlying CRT client and is not copyable or movable.
+   */
+  class AWS_S3_TRANSFER_API S3TransferManager {
+  public:
+    /**
+     * Initialize the S3TransferManager with the given configuration. The configuration
+     * is used to construct the underlying CRT client and is not retained after construction.
+     */
+    explicit S3TransferManager(const S3TransferManagerConfiguration& config);
+
+    ~S3TransferManager();
+
+    S3TransferManager(const S3TransferManager&) = delete;
+    S3TransferManager& operator=(const S3TransferManager&) = delete;
+    S3TransferManager(S3TransferManager&&) = delete;
+    S3TransferManager& operator=(S3TransferManager&&) = delete;
+
+    /**
+     * Begin uploading the object described by request. Returns immediately with a handle
+     * that can be used to wait for completion or to cancel the in-flight transfer.
+     */
+    UploadHandle Upload(const UploadRequest& request);
+
+    /**
+     * Begin downloading the object described by request. Returns immediately with a handle
+     * that can be used to wait for completion or to cancel the in-flight transfer.
+     */
+    DownloadHandle Download(const DownloadRequest& request);
+
+  private:
+    Aws::UniquePtr<S3TransferManagerImpl> m_impl;
+  };
+  }
   }
-}
+  }
+
+
 
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadHandle.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadHandle.h
new file mode 100644
index 000000000000..842314542265
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadHandle.h
@@ -0,0 +1,44 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+#include <future>
+#include <memory>
+#include <aws/s3-transfer/UploadResponse.h>
+
+
+namespace Aws {
+namespace S3 {
+namespace Transfer {
+
+class UploadHandleImpl;
+
+/**
+ * Returned from S3TransferManager::Upload to represent a single in-flight upload. The
+ * handle is freely copyable; all copies share the same underlying transfer state.
+ */
+class AWS_S3_TRANSFER_API UploadHandle {
+public:
+  ~UploadHandle();
+
+  /**
+   * Returns a future that resolves once the transfer finishes, succeeds, or fails.
+   */
+  std::shared_future<UploadResponse> CompletionFuture() const;
+
+  /**
+   * Requests cancellation of the in-flight upload. Returns immediately; the future
+   * returned by CompletionFuture will resolve with a failure once the cancel takes effect.
+   */
+  void Cancel();
+
+private:
+  std::shared_ptr<UploadHandleImpl> m_impl;
+};
+
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressListener.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressListener.h
new file mode 100644
index 000000000000..d180877c3e73
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressListener.h
@@ -0,0 +1,48 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+
+namespace Aws {
+namespace S3 {
+namespace Transfer {
+
+class UploadRequest;
+class UploadProgressSnapshot;
+
+/**
+ * Callback interface for receiving event-driven updates throughout the lifecycle of an upload.
+ * Subclass and override the events of interest; default implementations are empty so unused
+ * callbacks can be ignored. Listeners may be registered on the request or on the manager.
+ */
+class AWS_S3_TRANSFER_API UploadProgressListener {
+ public:
+  virtual ~UploadProgressListener() = default;
+
+  /**
+   * Invoked exactly once when the upload begins, before any bytes have been transferred.
+   */
+  virtual void OnTransferInitiated(const UploadRequest&, const UploadProgressSnapshot&) {}
+
+  /**
+   * Invoked as bytes are submitted to S3. Called at least once for a successful transfer
+   * and may be called many times depending on object size and I/O buffer sizes.
+   */
+  virtual void OnBytesTransferred(const UploadRequest&, const UploadProgressSnapshot&) {}
+
+  /**
+   * Invoked exactly once when the upload completes successfully.
+   */
+  virtual void OnTransferComplete(const UploadRequest&, const UploadProgressSnapshot&) {}
+
+  /**
+   * Invoked exactly once when the upload fails or is cancelled.
+   */
+  virtual void OnTransferFailed(const UploadRequest&, const UploadProgressSnapshot&) {}
+};
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressSnapshot.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressSnapshot.h
new file mode 100644
index 000000000000..b7d63a90851f
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadProgressSnapshot.h
@@ -0,0 +1,46 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#pragma once
+#include <aws/s3-transfer/S3Transfer_EXPORTS.h>
+#include <aws/s3-transfer/UploadResponse.h>
+#include <cstdint>
+#include <memory>
+#include <utility>
+
+namespace Aws {
+namespace S3 {
+namespace Transfer {
+
+/**
+ * Immutable snapshot of upload progress passed to UploadProgressListener callbacks. Captures
+ * bytes transferred, total bytes (known up-front for uploads), and the response once available.
+ */
+class AWS_S3_TRANSFER_API UploadProgressSnapshot {
+ public:
+  UploadProgressSnapshot(uint64_t transferredBytes,
+                         uint64_t totalBytes,
+                         std::shared_ptr<UploadResponse> response,
+                         bool totalBytesHasBeenSet)
+      : m_transferredBytes(transferredBytes),
+        m_totalBytes(totalBytes),
+        m_response(std::move(response)),
+        m_totalBytesHasBeenSet(totalBytesHasBeenSet) {}
+
+  inline uint64_t GetTransferredBytes() const { return m_transferredBytes; }
+  inline uint64_t GetTotalBytes() const { return m_totalBytes; }
+  inline bool TotalBytesHasBeenSet() const { return m_totalBytesHasBeenSet; }
+  inline const std::shared_ptr<UploadResponse>& GetResponse() const { return m_response; }
+  inline bool ResponseHasBeenSet() const { return m_response != nullptr; }
+
+ private:
+  uint64_t m_transferredBytes = 0;
+  uint64_t m_totalBytes = 0;
+  std::shared_ptr<UploadResponse> m_response;
+  bool m_totalBytesHasBeenSet = false;
+};
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h
index 56bba8475ce3..1bb93d8cb8e9 100644
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadRequest.h
@@ -1,18 +1,94 @@
 /**
-* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0.
  */
 #pragma once
 #include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
+#include <aws/s3-transfer/UploadProgressListener.h>
+#include <aws/core/utils/memory/stl/AWSString.h>
+#include <aws/core/utils/memory/stl/AWSVector.h>
+#include <aws/s3/model/PutObjectRequest.h>
+#include <memory>
+#include <utility>
 
 namespace Aws {
-  namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API UploadResponse {
-        //need to fill in class defintion later
-      };
-    }
+namespace S3 {
+namespace Transfer {
+
+/**
+ * Request type for S3TransferManager::Upload. Carries the inner S3 PutObjectRequest along
+ * with the local source (file path or stream) and any request-level progress listeners.
+ * The transfer manager chooses between a single PutObject and a multipart upload based on
+ * the configured threshold.
+ */
+class AWS_S3_TRANSFER_API UploadRequest {
+ public:
+  inline const Aws::S3::Model::PutObjectRequest& GetS3Request() const { return m_s3Request; }
+  inline bool S3RequestHasBeenSet() const { return m_s3RequestHasBeenSet; }
+  template <typename S3RequestT = Aws::S3::Model::PutObjectRequest>
+  void SetS3Request(S3RequestT&& val) {
+    m_s3RequestHasBeenSet = true;
+    m_s3Request = std::forward<S3RequestT>(val);
+  }
+  template <typename S3RequestT = Aws::S3::Model::PutObjectRequest>
+  UploadRequest& WithS3Request(S3RequestT&& value) {
+    SetS3Request(std::forward<S3RequestT>(value));
+    return *this;
   }
-}
 
+  inline const Aws::String& GetSourceFilePath() const { return m_sourceFilePath; }
+  inline bool SourceFilePathHasBeenSet() const { return m_sourceFilePathHasBeenSet; }
+  template <typename SourceFilePathT = Aws::String>
+  void SetSourceFilePath(SourceFilePathT&& value) {
+    m_sourceFilePathHasBeenSet = true;
+    m_sourceFilePath = std::forward<SourceFilePathT>(value);
+  }
+  template <typename SourceFilePathT = Aws::String>
+  UploadRequest& WithSourceFilePath(SourceFilePathT&& value) {
+    SetSourceFilePath(std::forward<SourceFilePathT>(value));
+    return *this;
+  }
+
+  inline const std::shared_ptr<Aws::IOStream>& GetBody() const { return m_body; }
+  inline bool BodyHasBeenSet() const { return m_bodyHasBeenSet; }
+  inline void SetBody(const std::shared_ptr<Aws::IOStream>& val) {
+    m_bodyHasBeenSet = true;
+    m_body = val;
+  }
+  inline UploadRequest& WithBody(const std::shared_ptr<Aws::IOStream>& val) {
+    SetBody(val);
+    return *this;
+  }
+
+  inline const Aws::Vector<std::shared_ptr<UploadProgressListener>>& GetTransferListeners() const {
+    return m_transferListeners;
+  }
+  inline bool TransferListenersHasBeenSet() const { return m_transferListenersHasBeenSet; }
+  inline void SetTransferListeners(const Aws::Vector<std::shared_ptr<UploadProgressListener>>& val) {
+    m_transferListenersHasBeenSet = true;
+    m_transferListeners = val;
+  }
+  inline UploadRequest& WithTransferListeners(const Aws::Vector<std::shared_ptr<UploadProgressListener>>& val) {
+    SetTransferListeners(val);
+    return *this;
+  }
+  inline UploadRequest& AddTransferListener(const std::shared_ptr<UploadProgressListener>& listener) {
+    m_transferListenersHasBeenSet = true;
+    m_transferListeners.push_back(listener);
+    return *this;
+  }
+
+ private:
+  Aws::S3::Model::PutObjectRequest m_s3Request;
+  Aws::String m_sourceFilePath;
+  std::shared_ptr<Aws::IOStream> m_body;
+  Aws::Vector<std::shared_ptr<UploadProgressListener>> m_transferListeners;
+  bool m_s3RequestHasBeenSet = false;
+  bool m_sourceFilePathHasBeenSet = false;
+  bool m_bodyHasBeenSet = false;
+  bool m_transferListenersHasBeenSet = false;
+};
+
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h
index 56bba8475ce3..110aa3f22800 100644
--- a/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h
+++ b/src/aws-cpp-sdk-s3-transfer/include/aws/s3-transfer/UploadResponse.h
@@ -1,18 +1,41 @@
 /**
-* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0.
  */
 #pragma once
 #include <aws/s3-transfer/S3Transfer_EXPORTS.h>
-
+#include <aws/s3/model/PutObjectResult.h>
+#include <utility>
 
 namespace Aws {
-  namespace S3 {
-    namespace Transfer {
-      class AWS_S3_TRANSFER_API UploadResponse {
-        //need to fill in class defintion later
-      };
-    }
+namespace S3 {
+namespace Transfer {
+
+/**
+ * Response type returned via the UploadHandle's future once the transfer completes. Wraps
+ * the underlying S3 PutObjectResult, populated from either the single PutObject response
+ * or the CompleteMultipartUpload response depending on the path taken.
+ */
+class AWS_S3_TRANSFER_API UploadResponse {
+ public:
+  inline const Aws::S3::Model::PutObjectResult& GetS3Result() const { return m_s3Result; }
+  inline bool S3ResultHasBeenSet() const { return m_s3ResultHasBeenSet; }
+  template <typename S3ResultT = Aws::S3::Model::PutObjectResult>
+  void SetS3Result(S3ResultT&& s3Result) {
+    m_s3ResultHasBeenSet = true;
+    m_s3Result = std::forward<S3ResultT>(s3Result);
   }
-}
+  template <typename S3ResultT = Aws::S3::Model::PutObjectResult>
+  UploadResponse& WithS3Result(S3ResultT&& s3Result) {
+    SetS3Result(std::forward<S3ResultT>(s3Result));
+    return *this;
+  }
+
+ private:
+  Aws::S3::Model::PutObjectResult m_s3Result;
+  bool m_s3ResultHasBeenSet = false;
+};
 
+}
+}
+}
diff --git a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/DownloadHandle.cpp b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/DownloadHandle.cpp
new file mode 100644
index 000000000000..6810a6c878c1
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/DownloadHandle.cpp
@@ -0,0 +1,23 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+   * SPDX-License-Identifier: Apache-2.0.
+   */
+  #include <aws/s3-transfer/DownloadHandle.h>
+
+  namespace Aws {
+  namespace S3 {
+  namespace Transfer {
+  class DownloadHandleImpl {
+
+  };
+  DownloadHandle::~DownloadHandle() = default;
+
+  std::shared_future<DownloadResponse> DownloadHandle::CompletionFuture() const {
+    return {};
+  }
+  void DownloadHandle::Cancel() {
+
+  }
+  }
+  }
+  }
diff --git a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp
index 992407a5caf3..baf1d513aa5b 100644
--- a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp
+++ b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/S3TransferManager.cpp
@@ -1,15 +1,31 @@
 /**
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
-* SPDX-License-Identifier: Apache-2.0.
-*/
-
+   * SPDX-License-Identifier: Apache-2.0.
+   */
 #include <aws/s3-transfer/S3TransferManager.h>
-
+#include <aws/core/utils/memory/AWSMemory.h>
 
 namespace Aws {
-  namespace S3{
-    namespace Transfer {
+namespace S3 {
+namespace Transfer {
+class S3TransferManagerImpl {
+
+};
+S3TransferManager::~S3TransferManager() = default;
+
+S3TransferManager::S3TransferManager(const S3TransferManagerConfiguration& ) :
+m_impl(Aws::MakeUnique<S3TransferManagerImpl>("S3TransferManager")) {
+
+}
 
-    }
-  }
+UploadHandle S3TransferManager::Upload(const UploadRequest&) {
+  return UploadHandle();
+}
+
+DownloadHandle S3TransferManager::Download(const DownloadRequest&) {
+  return DownloadHandle();
+}
+
+}
+}
 }
diff --git a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/UploadHandle.cpp b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/UploadHandle.cpp
new file mode 100644
index 000000000000..36dc39a0d5a6
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/UploadHandle.cpp
@@ -0,0 +1,23 @@
+/**
+* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+   * SPDX-License-Identifier: Apache-2.0.
+   */
+  #include <aws/s3-transfer/UploadHandle.h>
+
+  namespace Aws {
+  namespace S3 {
+  namespace Transfer {
+  class UploadHandleImpl {
+
+  };
+  UploadHandle::~UploadHandle() = default;
+
+  std::shared_future<UploadResponse> UploadHandle::CompletionFuture() const {
+    return {};
+  }
+  void UploadHandle::Cancel() {
+
+  }
+  }
+  }
+  }
diff --git a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.cpp b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.cpp
new file mode 100644
index 000000000000..a20a8989f78d
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.cpp
@@ -0,0 +1,5 @@
+//
+// Created by Narahari, Vinay on 6/5/26.
+//
+
+#include "CrtOperations.h"
diff --git a/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.h b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.h
new file mode 100644
index 000000000000..184e4d89777d
--- /dev/null
+++ b/src/aws-cpp-sdk-s3-transfer/source/s3-transfer/internal/CrtOperations.h
@@ -0,0 +1,10 @@
+//
+// Created by Narahari, Vinay on 6/5/26.
+//
+
+#ifndef AWSSDK_CRTOPERATIONS_H
+#define AWSSDK_CRTOPERATIONS_H
+
+class CrtOperations {};
+
+#endif  // AWSSDK_CRTOPERATIONS_H