diff --git a/fbpcf/gcp/GCSUtil.cpp b/fbpcf/gcp/GCSUtil.cpp
index 6f17306d..ee67b21c 100644
--- a/fbpcf/gcp/GCSUtil.cpp
+++ b/fbpcf/gcp/GCSUtil.cpp
@@ -58,4 +58,8 @@ GCSObjectReference uriToObjectReference(std::string url) {
   return GCSObjectReference{bucket, path.substr(pos + 1)};
 }
 
+std::unique_ptr<google::cloud::storage::Client> createGCSClient() {
+  return std::make_unique<google::cloud::storage::Client>();
+}
+
 } // namespace fbpcf::gcp
diff --git a/fbpcf/gcp/GCSUtil.h b/fbpcf/gcp/GCSUtil.h
index 69839b41..6820c30c 100644
--- a/fbpcf/gcp/GCSUtil.h
+++ b/fbpcf/gcp/GCSUtil.h
@@ -22,6 +22,5 @@ struct GCSObjectReference {
 };
 
 GCSObjectReference uriToObjectReference(std::string url);
-std::unique_ptr<google::cloud::storage::Client> createGCSClient(
-    const GCSClientOption& option);
+std::unique_ptr<google::cloud::storage::Client> createGCSClient();
 } // namespace fbpcf::gcp
diff --git a/fbpcf/io/cloud_util/CloudFileUtil.cpp b/fbpcf/io/cloud_util/CloudFileUtil.cpp
index 2f39cba9..15863dcd 100644
--- a/fbpcf/io/cloud_util/CloudFileUtil.cpp
+++ b/fbpcf/io/cloud_util/CloudFileUtil.cpp
@@ -5,10 +5,17 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#include "fbpcf/io/cloud_util/CloudFileUtil.h"
+#include <aws/s3/S3Client.h>
+#include <google/cloud/storage/client.h>
 #include <re2/re2.h>
+
 #include "fbpcf/aws/S3Util.h"
 #include "fbpcf/exception/PcfException.h"
+#include "fbpcf/gcp/GCSUtil.h"
+#include "fbpcf/io/cloud_util/CloudFileUtil.h"
+#include "fbpcf/io/cloud_util/GCSClient.h"
+#include "fbpcf/io/cloud_util/GCSFileReader.h"
+#include "fbpcf/io/cloud_util/GCSFileUploader.h"
 #include "fbpcf/io/cloud_util/S3Client.h"
 #include "fbpcf/io/cloud_util/S3FileReader.h"
 #include "fbpcf/io/cloud_util/S3FileUploader.h"
@@ -16,15 +23,17 @@
 namespace fbpcf::cloudio {
 
 CloudFileType getCloudFileType(const std::string& filePath) {
-  // S3 file format:
-  // 1. https://bucket-name.s3.region.amazonaws.com/key-name
-  // 2. https://bucket-name.s3-region.amazonaws.com/key-name
-  // 3. s3://bucket-name/key-name
-  // GCS file format:
-  // 1. https://storage.cloud.google.com/bucket-name/key-name
-  // 2. https://bucket-name.storage.googleapis.com/key-name
-  // 3. https://storage.googleapis.com/bucket-name/key-name
-  // 4. gs://bucket-name/key-name
+  /*
+   * S3 file format:
+   *   1. https://bucket-name.s3.region.amazonaws.com/key-name
+   *   2. https://bucket-name.s3-region.amazonaws.com/key-name
+   *   3. s3://bucket-name/key-name
+   * GCS file format:
+   *   1. https://storage.cloud.google.com/bucket-name/key-name
+   *   2. https://bucket-name.storage.googleapis.com/key-name
+   *   3. https://storage.googleapis.com/bucket-name/key-name
+   *   4. gs://bucket-name/key-name
+   */
   static const re2::RE2 s3Regex1(
       "https://[a-z0-9.-]+.s3.[a-z0-9-]+.amazonaws.com/.+");
   static const re2::RE2 s3Regex2(
@@ -58,8 +67,12 @@ std::unique_ptr<IFileReader> getCloudFileReader(const std::string& filePath) {
         fbpcf::cloudio::S3Client::getInstance(
             fbpcf::aws::S3ClientOption{.region = ref.region})
             .getS3Client());
+  } else if (fileType == CloudFileType::GCS) {
+    return std::make_unique<GCSFileReader>(
+        fbpcf::cloudio::GCSClient::getInstance(fbpcf::gcp::GCSClientOption{})
+            .getGCSClient());
   } else {
-    return nullptr;
+    throw fbpcf::PcfException("Not supported yet.");
   }
 }
 
@@ -73,6 +86,11 @@ std::unique_ptr<IFileUploader> getCloudFileUploader(
             fbpcf::aws::S3ClientOption{.region = ref.region})
             .getS3Client(),
         filePath);
+  } else if (fileType == CloudFileType::GCS) {
+    return std::make_unique<GCSFileUploader>(
+        fbpcf::cloudio::GCSClient::getInstance(fbpcf::gcp::GCSClientOption{})
+            .getGCSClient(),
+        filePath);
   } else {
     throw fbpcf::PcfException("Not supported yet.");
   }
diff --git a/fbpcf/io/cloud_util/GCSClient.cpp b/fbpcf/io/cloud_util/GCSClient.cpp
new file mode 100644
index 00000000..06829fc0
--- /dev/null
+++ b/fbpcf/io/cloud_util/GCSClient.cpp
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <google/cloud/storage/client.h>
+
+#include "fbpcf/io/cloud_util/GCSClient.h"
+
+namespace fbpcf::cloudio {
+GCSClient& GCSClient::getInstance(const fbpcf::gcp::GCSClientOption& option) {
+  static GCSClient GCSClient(option);
+  return GCSClient;
+}
+} // namespace fbpcf::cloudio
diff --git a/fbpcf/io/cloud_util/GCSClient.h b/fbpcf/io/cloud_util/GCSClient.h
new file mode 100644
index 00000000..049ff171
--- /dev/null
+++ b/fbpcf/io/cloud_util/GCSClient.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <memory>
+
+#include <google/cloud/storage/client.h>
+#include "fbpcf/gcp/GCSUtil.h"
+
+namespace fbpcf::cloudio {
+
+class GCSClient {
+ private:
+  explicit GCSClient(const fbpcf::gcp::GCSClientOption& option) {
+    GCSClient_ = fbpcf::gcp::createGCSClient();
+  }
+
+ public:
+  static GCSClient& getInstance(const fbpcf::gcp::GCSClientOption& option);
+
+  std::shared_ptr<google::cloud::storage::Client> getGCSClient() {
+    return GCSClient_;
+  }
+
+ private:
+  std::shared_ptr<google::cloud::storage::Client> GCSClient_;
+};
+
+} // namespace fbpcf::cloudio
diff --git a/fbpcf/io/cloud_util/GCSFileReader.cpp b/fbpcf/io/cloud_util/GCSFileReader.cpp
index e88cc377..b18d7229 100644
--- a/fbpcf/io/cloud_util/GCSFileReader.cpp
+++ b/fbpcf/io/cloud_util/GCSFileReader.cpp
@@ -12,8 +12,8 @@
 
 namespace fbpcf::cloudio {
 
-template <class ClientCls>
-std::string GCSFileReader<ClientCls>::readBytes(
+// template <class ClientCls>
+std::string GCSFileReader::readBytes(
     const std::string& filePath,
     std::size_t start,
     std::size_t end) {
@@ -29,15 +29,16 @@ std::string GCSFileReader<ClientCls>::readBytes(
   return ss.str();
 }
 
-template <class ClientCls>
-size_t GCSFileReader<ClientCls>::getFileContentLength(
-    const std::string& filePath) {
+// template <class ClientCls>
+size_t GCSFileReader::getFileContentLength(const std::string& filePath) {
   const auto& ref = fbpcf::gcp::uriToObjectReference(filePath);
   auto outcome = GCSClient_->GetObjectMetadata(ref.bucket, ref.key);
   if (!outcome) {
-    throw GcpException{"Error getting object metadata for object " + ref.key};
+    throw GcpException{
+        "Error getting object metadata for object " + ref.key +
+        " Reason: " + outcome.status().message()};
   }
-  return outcome.size();
+  return outcome->size();
 }
 
 } // namespace fbpcf::cloudio
diff --git a/fbpcf/io/cloud_util/GCSFileReader.h b/fbpcf/io/cloud_util/GCSFileReader.h
index fa77e639..441ca81b 100644
--- a/fbpcf/io/cloud_util/GCSFileReader.h
+++ b/fbpcf/io/cloud_util/GCSFileReader.h
@@ -14,10 +14,9 @@
 #include "fbpcf/io/cloud_util/IFileReader.h"
 
 namespace fbpcf::cloudio {
-template <class ClientCls>
 class GCSFileReader : public IFileReader {
  public:
-  explicit GCSFileReader(std::shared_ptr<ClientCls> client)
+  explicit GCSFileReader(std::shared_ptr<google::cloud::storage::Client> client)
       : GCSClient_{std::move(client)} {}
 
   std::string readBytes(
@@ -28,7 +27,7 @@ class GCSFileReader : public IFileReader {
   size_t getFileContentLength(const std::string& filePath) override;
 
  private:
-  std::shared_ptr<ClientCls> GCSClient_;
+  std::shared_ptr<google::cloud::storage::Client> GCSClient_;
 };
 
 } // namespace fbpcf::cloudio
diff --git a/fbpcf/io/cloud_util/GCSFileUploader.cpp b/fbpcf/io/cloud_util/GCSFileUploader.cpp
new file mode 100644
index 00000000..cb1ab287
--- /dev/null
+++ b/fbpcf/io/cloud_util/GCSFileUploader.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <folly/logging/xlog.h>
+
+#include "fbpcf/exception/GcpException.h"
+#include "fbpcf/gcp/GCSUtil.h"
+#include "fbpcf/io/cloud_util/GCSFileUploader.h"
+
+namespace fbpcf::cloudio {
+static const std::string FILE_TYPE = "text/csv";
+
+void GCSFileUploader::init() {}
+
+int32_t GCSFileUploader::upload(std::vector<char>& buf) {
+  XLOG(INFO) << "Start resumable upload. ";
+  const auto& ref = fbpcf::gcp::uriToObjectReference(filePath_);
+  std::string bucket_ = ref.bucket;
+  std::string object_ = ref.key;
+
+  namespace gcs = ::google::cloud::storage;
+  using ::google::cloud::StatusOr;
+  std::string str(buf.begin(), buf.end());
+
+  StatusOr<gcs::ObjectMetadata> object_metadata = gcsClient_->InsertObject(
+      bucket_, object_, str, gcs::ContentType(FILE_TYPE));
+
+  if (!object_metadata) {
+    throw GcpException{
+        "Resumable upload failed: " + object_metadata.status().message()};
+    return 0;
+  }
+  XLOG(INFO) << " Resumable upload successful ";
+  XLOG(INFO) << "Bucket: " << bucket_ << ", Object Name: " << object_;
+  return str.size();
+}
+
+int GCSFileUploader::complete() {
+  return 0;
+}
+} // namespace fbpcf::cloudio
diff --git a/fbpcf/io/cloud_util/GCSFileUploader.h b/fbpcf/io/cloud_util/GCSFileUploader.h
new file mode 100644
index 00000000..c099ec00
--- /dev/null
+++ b/fbpcf/io/cloud_util/GCSFileUploader.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include <google/cloud/storage/client.h>
+#include "fbpcf/io/cloud_util/IFileUploader.h"
+
+namespace fbpcf::cloudio {
+class GCSFileUploader : public IFileUploader {
+ public:
+  explicit GCSFileUploader(
+      std::shared_ptr<google::cloud::storage::Client> gcsClient,
+      const std::string& filePath)
+      : gcsClient_{std::move(gcsClient)}, filePath_{filePath} {
+    init();
+  }
+  int upload(std::vector<char>& buf) override;
+  int complete() override;
+
+ private:
+  void init() override;
+
+  std::shared_ptr<google::cloud::storage::Client> gcsClient_;
+  const std::string filePath_;
+};
+
+} // namespace fbpcf::cloudio