diff --git a/.github/workflows/validate.yaml b/.github/workflows/validate.yaml
index 334c01a7..e0e41c86 100644
--- a/.github/workflows/validate.yaml
+++ b/.github/workflows/validate.yaml
@@ -38,7 +38,7 @@ jobs:
     - name: Build Presence
       run: CC=clang CXX=clang++ bazel build --features=-layering_check //presence --spawn_strategy=standalone
     - name: Build Sharing
-      run: CC=clang CXX=clang++ bazel build --features=-layering_check //sharing/proto:all //sharing/internal/public:nearby_context //sharing/common:all //sharing/scheduling:scheduling --spawn_strategy=standalone
+      run: CC=clang CXX=clang++ bazel build --features=-layering_check //sharing/proto:all //sharing/internal/public:nearby_context //sharing/common:all //sharing/scheduling:scheduling //sharing/fast_initiation:nearby_fast_initiation --spawn_strategy=standalone
 
   build-rust-linux:
     name: Build Rust on Linux
diff --git a/sharing/fast_initiation/BUILD b/sharing/fast_initiation/BUILD
new file mode 100644
index 00000000..3f67af3c
--- /dev/null
+++ b/sharing/fast_initiation/BUILD
@@ -0,0 +1,69 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+licenses(["notice"])
+
+cc_library(
+    name = "nearby_fast_initiation",
+    srcs = [
+        "nearby_fast_initiation_impl.cc",
+    ],
+    hdrs = [
+        "nearby_fast_initiation.h",
+        "nearby_fast_initiation_impl.h",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//internal/base",
+        "//sharing/internal/api:platform",
+        "//sharing/internal/public:logging",
+        "//sharing/internal/public:types",
+    ],
+)
+
+cc_library(
+    name = "test_support",
+    testonly = True,
+    srcs = [
+        "fake_nearby_fast_initiation.cc",
+    ],
+    hdrs = [
+        "fake_nearby_fast_initiation.h",
+        "fake_nearby_fast_initiation_observer.h",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":nearby_fast_initiation",
+        "//internal/base",
+        "//sharing/internal/public:logging",
+        "//sharing/internal/public:types",
+        "@com_google_absl//absl/memory",
+    ],
+)
+
+cc_test(
+    name = "nearby_fast_initiation_test",
+    srcs = [
+        "nearby_fast_initiation_impl_test.cc",
+    ],
+    deps = [
+        ":nearby_fast_initiation",
+        ":test_support",
+        "//internal/platform/implementation/g3",  # fixdeps: keep
+        "//sharing/internal/api:platform",
+        "//sharing/internal/test:nearby_test",
+        "@com_github_protobuf_matchers//protobuf-matchers",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
diff --git a/sharing/fast_initiation/fake_nearby_fast_initiation.cc b/sharing/fast_initiation/fake_nearby_fast_initiation.cc
new file mode 100644
index 00000000..0c54a7c8
--- /dev/null
+++ b/sharing/fast_initiation/fake_nearby_fast_initiation.cc
@@ -0,0 +1,202 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "sharing/fast_initiation/fake_nearby_fast_initiation.h"
+
+#include <functional>
+#include <memory>
+#include <utility>
+
+#include "absl/memory/memory.h"
+#include "sharing/fast_initiation/nearby_fast_initiation.h"
+#include "sharing/internal/public/context.h"
+#include "sharing/internal/public/logging.h"
+
+namespace nearby {
+namespace sharing {
+
+void FakeNearbyFastInitiation::Factory::SetStartScanningError(
+    bool is_start_scanning_error) {
+  is_start_scanning_error_ = is_start_scanning_error;
+}
+
+void FakeNearbyFastInitiation::Factory::SetStartAdvertisingError(
+    bool is_start_advertising_error) {
+  is_start_advertising_error_ = is_start_advertising_error;
+}
+
+void FakeNearbyFastInitiation::Factory::SetLowEnergySupported(
+    bool is_low_energy_supported) {
+  is_low_energy_supported_ = is_low_energy_supported;
+}
+
+void FakeNearbyFastInitiation::Factory::SetScanOffloadSupported(
+    bool is_scan_offload_supported) {
+  is_scan_offload_supported_ = is_scan_offload_supported;
+}
+
+void FakeNearbyFastInitiation::Factory::SetAdvertisementOffloadSupported(
+    bool is_advertisement_offload_supported) {
+  is_advertisement_offload_supported_ = is_advertisement_offload_supported;
+}
+
+FakeNearbyFastInitiation*
+FakeNearbyFastInitiation::Factory::GetNearbyFastInitiation() {
+  return fake_nearby_fast_initiation_;
+}
+
+std::unique_ptr<NearbyFastInitiation>
+FakeNearbyFastInitiation::Factory::CreateInstance(Context* context) {
+  fake_nearby_fast_initiation_ = new FakeNearbyFastInitiation(context);
+  fake_nearby_fast_initiation_->SetStartScanningError(is_start_scanning_error_);
+  fake_nearby_fast_initiation_->SetStartAdvertisingError(
+      is_start_advertising_error_);
+  fake_nearby_fast_initiation_->SetLowEnergySupported(is_low_energy_supported_);
+  fake_nearby_fast_initiation_->SetScanOffloadSupported(
+      is_scan_offload_supported_);
+  fake_nearby_fast_initiation_->SetAdvertisementOffloadSupported(
+      is_advertisement_offload_supported_);
+  return absl::WrapUnique<NearbyFastInitiation>(fake_nearby_fast_initiation_);
+}
+
+FakeNearbyFastInitiation::FakeNearbyFastInitiation(Context* context)
+    : context_(context) {
+  NL_DCHECK(context_);
+}
+
+bool FakeNearbyFastInitiation::IsLowEnergySupported() {
+  return is_low_energy_supported_;
+}
+
+bool FakeNearbyFastInitiation::IsScanOffloadSupported() {
+  return is_scan_offload_supported_;
+}
+
+bool FakeNearbyFastInitiation::IsAdvertisementOffloadSupported() {
+  return is_advertisement_offload_supported_;
+}
+
+void FakeNearbyFastInitiation::StartScanning(
+    std::function<void()> devices_discovered_callback,
+    std::function<void()> devices_not_discovered_callback,
+    std::function<void()> error_callback) {
+  ++start_scanning_call_count_;
+  if (is_start_scanning_error_) {
+    error_callback();
+    return;
+  }
+
+  is_scanning_ = true;
+  scanning_devices_discovered_callback_ =
+      std::move(devices_discovered_callback);
+  scanning_devices_not_discovered_callback_ =
+      std::move(devices_not_discovered_callback);
+}
+
+void FakeNearbyFastInitiation::StopScanning(std::function<void()> callback) {
+  ++stop_scanning_call_count_;
+  is_scanning_ = false;
+  callback();
+}
+
+void FakeNearbyFastInitiation::StartAdvertising(
+    FastInitType type, std::function<void()> callback,
+    std::function<void()> error_callback) {
+  ++start_advertising_call_count_;
+  if (is_start_advertising_error_) {
+    error_callback();
+  } else {
+    is_advertising_ = true;
+    callback();
+  }
+}
+
+void FakeNearbyFastInitiation::StopAdvertising(std::function<void()> callback) {
+  ++stop_advertising_call_count_;
+  is_advertising_ = false;
+  callback();
+}
+
+void FakeNearbyFastInitiation::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+void FakeNearbyFastInitiation::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+bool FakeNearbyFastInitiation::HasObserver(Observer* observer) {
+  return observer_list_.HasObserver(observer);
+}
+
+// Fake methods
+void FakeNearbyFastInitiation::SetStartScanningError(
+    bool is_start_scanning_error) {
+  is_start_scanning_error_ = is_start_scanning_error;
+  for (Observer* observer : observer_list_.GetObservers()) {
+    if (observer != nullptr) {
+      observer->HardwareErrorReported(this);
+    }
+  }
+}
+
+void FakeNearbyFastInitiation::SetStartAdvertisingError(
+    bool is_start_advertising_error) {
+  is_start_advertising_error_ = is_start_advertising_error;
+  for (Observer* observer : observer_list_.GetObservers()) {
+    if (observer != nullptr) {
+      observer->HardwareErrorReported(this);
+    }
+  }
+}
+
+void FakeNearbyFastInitiation::SetLowEnergySupported(
+    bool is_low_energy_supported) {
+  is_low_energy_supported_ = is_low_energy_supported;
+}
+
+void FakeNearbyFastInitiation::SetScanOffloadSupported(
+    bool is_scan_offload_supported) {
+  is_scan_offload_supported_ = is_scan_offload_supported;
+}
+
+void FakeNearbyFastInitiation::SetAdvertisementOffloadSupported(
+    bool is_advertisement_offload_supported) {
+  is_advertisement_offload_supported_ = is_advertisement_offload_supported;
+}
+
+int FakeNearbyFastInitiation::StartScanningCount() const {
+  return start_scanning_call_count_;
+}
+
+int FakeNearbyFastInitiation::StopScanningCount() const {
+  return stop_scanning_call_count_;
+}
+
+int FakeNearbyFastInitiation::StartAdvertisingCount() const {
+  return start_advertising_call_count_;
+}
+
+int FakeNearbyFastInitiation::StopAdvertisingCount() const {
+  return stop_advertising_call_count_;
+}
+
+void FakeNearbyFastInitiation::FireDevicesDetected() {
+  scanning_devices_discovered_callback_();
+}
+
+void FakeNearbyFastInitiation::FireDevicesNotDetected() {
+  scanning_devices_not_discovered_callback_();
+}
+
+}  // namespace sharing
+}  // namespace nearby
diff --git a/sharing/fast_initiation/fake_nearby_fast_initiation.h b/sharing/fast_initiation/fake_nearby_fast_initiation.h
new file mode 100644
index 00000000..719342ba
--- /dev/null
+++ b/sharing/fast_initiation/fake_nearby_fast_initiation.h
@@ -0,0 +1,128 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_FAKE_NEARBY_FAST_INITIATION_H_
+#define THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_FAKE_NEARBY_FAST_INITIATION_H_
+
+#include <functional>
+#include <memory>
+
+#include "internal/base/observer_list.h"
+#include "sharing/fast_initiation/nearby_fast_initiation.h"
+#include "sharing/fast_initiation/nearby_fast_initiation_impl.h"
+#include "sharing/internal/public/context.h"
+
+namespace nearby {
+namespace sharing {
+
+// FakeNearbyFastInitiation is a fake implementation of NearbyFastInitiation.
+// In the implementation, developers can simulate different output by calling
+// faked methods, such as setting offload supports on scanning or advertising.
+class FakeNearbyFastInitiation : public NearbyFastInitiation {
+ public:
+  class Factory : public NearbyFastInitiationImpl::Factory {
+   public:
+    Factory() = default;
+    ~Factory() override = default;
+
+    void SetStartScanningError(bool is_start_scanning_error);
+
+    void SetStartAdvertisingError(bool is_start_advertising_error);
+
+    void SetLowEnergySupported(bool is_low_energy_supported);
+
+    void SetScanOffloadSupported(bool is_scan_offload_supported);
+
+    void SetAdvertisementOffloadSupported(
+        bool is_advertisement_offload_supported);
+
+    FakeNearbyFastInitiation* GetNearbyFastInitiation();
+
+   private:
+    std::unique_ptr<NearbyFastInitiation> CreateInstance(
+        Context* context) override;
+
+    bool is_start_scanning_error_ = false;
+    bool is_start_advertising_error_ = false;
+    bool is_low_energy_supported_ = true;
+    bool is_scan_offload_supported_ = true;
+    bool is_advertisement_offload_supported_ = true;
+    FakeNearbyFastInitiation* fake_nearby_fast_initiation_ = nullptr;
+  };
+
+  explicit FakeNearbyFastInitiation(Context* context);
+  ~FakeNearbyFastInitiation() override = default;
+
+  bool IsLowEnergySupported() override;
+  bool IsScanOffloadSupported() override;
+  bool IsAdvertisementOffloadSupported() override;
+
+  void StartScanning(std::function<void()> devices_discovered_callback,
+                     std::function<void()> devices_not_discovered_callback,
+                     std::function<void()> error_callback) override;
+
+  void StopScanning(std::function<void()> callback) override;
+
+  void StartAdvertising(FastInitType type, std::function<void()> callback,
+                        std::function<void()> error_callback) override;
+
+  void StopAdvertising(std::function<void()> callback) override;
+
+  bool IsScanning() const override { return is_scanning_; }
+  bool IsAdvertising() const override { return is_advertising_; }
+
+  void AddObserver(Observer* observer) override;
+  void RemoveObserver(Observer* observer) override;
+  bool HasObserver(Observer* observer) override;
+
+  // Fake methods
+  void SetStartScanningError(bool is_start_scanning_error);
+  void SetStartAdvertisingError(bool is_start_advertising_error);
+  void SetLowEnergySupported(bool is_low_energy_supported);
+  void SetScanOffloadSupported(bool is_scan_offload_supported);
+  void SetAdvertisementOffloadSupported(
+      bool is_advertisement_offload_supported);
+
+  int StartScanningCount() const;
+  int StopScanningCount() const;
+  int StartAdvertisingCount() const;
+  int StopAdvertisingCount() const;
+
+  void FireDevicesDetected();
+  void FireDevicesNotDetected();
+
+ private:
+  Context* context_;
+  bool is_scanning_ = false;
+  bool is_advertising_ = false;
+  bool is_start_scanning_error_ = false;
+  bool is_start_advertising_error_ = false;
+  bool is_low_energy_supported_ = true;
+  bool is_scan_offload_supported_ = true;
+  bool is_advertisement_offload_supported_ = true;
+  int start_scanning_call_count_ = 0;
+  int stop_scanning_call_count_ = 0;
+  int start_advertising_call_count_ = 0;
+  int stop_advertising_call_count_ = 0;
+
+  std::function<void()> scanning_devices_discovered_callback_ = nullptr;
+  std::function<void()> scanning_devices_not_discovered_callback_ = nullptr;
+
+  ObserverList<NearbyFastInitiation::Observer> observer_list_;
+};
+
+}  // namespace sharing
+}  // namespace nearby
+
+#endif  // THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_FAKE_NEARBY_FAST_INITIATION_H_
diff --git a/sharing/fast_initiation/fake_nearby_fast_initiation_observer.h b/sharing/fast_initiation/fake_nearby_fast_initiation_observer.h
new file mode 100644
index 00000000..22658998
--- /dev/null
+++ b/sharing/fast_initiation/fake_nearby_fast_initiation_observer.h
@@ -0,0 +1,46 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_FAKE_NEARBY_FAST_INITIATION_OBSERVER_H_
+#define THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_FAKE_NEARBY_FAST_INITIATION_OBSERVER_H_
+
+#include "sharing/fast_initiation/nearby_fast_initiation.h"
+
+namespace nearby {
+namespace sharing {
+
+class FakeNearbyFastInitiationObserver : public NearbyFastInitiation::Observer {
+ public:
+  explicit FakeNearbyFastInitiationObserver(
+      NearbyFastInitiation* fast_init_manager) {
+    fast_init_manager_ = fast_init_manager;
+    num_hardware_error_reported_ = 0;
+  }
+
+  void HardwareErrorReported(NearbyFastInitiation* fast_init_manager) override {
+    if (fast_init_manager_ == fast_init_manager) {
+      num_hardware_error_reported_ += 1;
+    }
+  }
+
+  int GetNumHardwareErrorReported() { return num_hardware_error_reported_; }
+
+ private:
+  NearbyFastInitiation* fast_init_manager_;
+  int num_hardware_error_reported_;
+};
+
+}  // namespace sharing
+}  // namespace nearby
+#endif  // THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_FAKE_NEARBY_FAST_INITIATION_OBSERVER_H_
diff --git a/sharing/fast_initiation/nearby_fast_initiation.h b/sharing/fast_initiation/nearby_fast_initiation.h
new file mode 100644
index 00000000..6b4e9d31
--- /dev/null
+++ b/sharing/fast_initiation/nearby_fast_initiation.h
@@ -0,0 +1,101 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_NEARBY_FAST_INITIATION_H_
+#define THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_NEARBY_FAST_INITIATION_H_
+
+#include <stdint.h>
+
+#include <functional>
+
+namespace nearby {
+namespace sharing {
+
+class NearbyFastInitiation {
+ public:
+  enum class Version { kV1 = 0 };
+
+  // Fast initialization type impacts on the metadata information in payload of
+  // advertising.
+  // kNotify = The sender is in the foreground, actively trying to send a file
+  // to another device. Receivers in the room should be alerted that they may
+  // need to enter Everyone mode to receive the file.
+  // kSilent = The phone is passively looking for nearby receivers, but the user
+  // has not explicitly tried to enter Nearby Share to send the file. The phone
+  // may cache the receivers nearby so that discovery is faster, or it may
+  // present these users on ambient surfaces
+  enum class FastInitType : uint8_t {
+    kNotify = 0,
+    kSilent = 1,
+  };
+
+  class Observer {
+   public:
+    virtual ~Observer() = default;
+
+    // Called when hardware error reported that requires PC restart
+    virtual void HardwareErrorReported(NearbyFastInitiation* fast_init) {}
+  };
+
+  virtual ~NearbyFastInitiation() = default;
+
+  virtual bool IsLowEnergySupported() = 0;
+  virtual bool IsScanOffloadSupported() = 0;
+  virtual bool IsAdvertisementOffloadSupported() = 0;
+
+  // Scans nearby devices using BLE.
+  // |devices_discovered_callback| is called when discovered devices from
+  // 0 to more. |devices_not_discovered_callback| is called when discovered
+  // devices become to 0 from more than one. |error_callback| is called
+  // when error happened.
+  virtual void StartScanning(
+      std::function<void()> devices_discovered_callback,
+      std::function<void()> devices_not_discovered_callback,
+      std::function<void()> error_callback) = 0;
+
+  // Stops Fast Initialization scanning. |callback| is called
+  // when scanning is stopped.
+  virtual void StopScanning(std::function<void()> callback) = 0;
+
+  // Begins broadcasting Fast Initiation advertisement. |callback| is called
+  // when advertising is started. |error_callback| is called if start
+  // advertising with errors.
+  // Note: FastInitType is currently hardcoded to kNotify under the hood. To
+  // support changing the FastInitType after initialization, additional APIs
+  // need to be added/refactored to Context to reinitialize/reset the
+  // FastInitiationManager with the desired type.
+  virtual void StartAdvertising(FastInitType type,
+                                std::function<void()> callback,
+                                std::function<void()> error_callback) = 0;
+
+  // Stop broadcasting Fast Initiation advertisements. |callback|
+  // is called when advertising is stopped.
+  virtual void StopAdvertising(std::function<void()> callback) = 0;
+
+  // Check the scanning status.
+  virtual bool IsScanning() const = 0;
+
+  // Check the advertising status.
+  virtual bool IsAdvertising() const = 0;
+
+  // Adds and removes observers for hardware error events.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+  virtual bool HasObserver(Observer* observer) = 0;
+};
+
+}  // namespace sharing
+}  // namespace nearby
+
+#endif  // THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_NEARBY_FAST_INITIATION_H_
diff --git a/sharing/fast_initiation/nearby_fast_initiation_impl.cc b/sharing/fast_initiation/nearby_fast_initiation_impl.cc
new file mode 100644
index 00000000..59c4f020
--- /dev/null
+++ b/sharing/fast_initiation/nearby_fast_initiation_impl.cc
@@ -0,0 +1,299 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "sharing/fast_initiation/nearby_fast_initiation_impl.h"
+
+#include <functional>
+#include <memory>
+#include <ostream>
+#include <utility>
+
+#include "sharing/fast_initiation/nearby_fast_initiation.h"
+#include "sharing/internal/api/bluetooth_adapter.h"
+#include "sharing/internal/api/fast_init_ble_beacon.h"
+#include "sharing/internal/api/fast_initiation_manager.h"
+#include "sharing/internal/public/context.h"
+#include "sharing/internal/public/logging.h"
+
+namespace nearby {
+namespace sharing {
+using ::nearby::api::FastInitiationManager;
+
+NearbyFastInitiationImpl::Factory*
+    NearbyFastInitiationImpl::Factory::test_factory_ = nullptr;
+
+std::unique_ptr<NearbyFastInitiation> NearbyFastInitiationImpl::Factory::Create(
+    Context* context) {
+  NL_DCHECK(context);
+  if (test_factory_) {
+    return test_factory_->CreateInstance(context);
+  }
+
+  return std::make_unique<NearbyFastInitiationImpl>(context);
+}
+
+void NearbyFastInitiationImpl::Factory::SetFactoryForTesting(
+    Factory* test_factory) {
+  test_factory_ = test_factory;
+}
+
+NearbyFastInitiationImpl::NearbyFastInitiationImpl(Context* context)
+    : context_(context) {
+  NL_DCHECK(context);
+}
+
+bool NearbyFastInitiationImpl::IsLowEnergySupported() {
+  return context_->GetBluetoothAdapter().IsLowEnergySupported();
+}
+
+bool NearbyFastInitiationImpl::IsScanOffloadSupported() {
+  return context_->GetBluetoothAdapter().IsScanOffloadSupported();
+}
+
+bool NearbyFastInitiationImpl::IsAdvertisementOffloadSupported() {
+  return context_->GetBluetoothAdapter().IsAdvertisementOffloadSupported();
+}
+
+bool NearbyFastInitiationImpl::IsScanning() const {
+  return context_->GetFastInitiationManager().IsScanning();
+}
+
+bool NearbyFastInitiationImpl::IsAdvertising() const {
+  return context_->GetFastInitiationManager().IsAdvertising();
+}
+
+void NearbyFastInitiationImpl::StartScanning(
+    std::function<void()> devices_discovered_callback,
+    std::function<void()> devices_not_discovered_callback,
+    std::function<void()> error_callback) {
+  if (IsScanning()) {
+    NL_LOG(WARNING) << __func__
+                    << ": FastInit BLE scanning was started already.";
+    error_callback();
+    return;
+  }
+
+  context_->GetFastInitiationManager().StartScanning(
+      std::move(devices_discovered_callback),
+      std::move(devices_not_discovered_callback),
+      [&, error_callback =
+              std::move(error_callback)](FastInitiationManager::Error error) {
+        ScanningErrorCodeCallbackHandler(error);
+        error_callback();
+      });
+}
+
+void NearbyFastInitiationImpl::StopScanning(std::function<void()> callback) {
+  if (!IsScanning()) {
+    NL_LOG(WARNING) << __func__ << ": FastInit BLE scanning is not running.";
+    callback();
+    return;
+  }
+  context_->GetFastInitiationManager().StopScanning(
+      [&, callback = std::move(callback)]() { callback(); });
+}
+
+void NearbyFastInitiationImpl::StartAdvertising(
+    FastInitType type, std::function<void()> callback,
+    std::function<void()> error_callback) {
+  if (IsAdvertising()) {
+    NL_LOG(WARNING) << __func__
+                    << ": FastInit BLE advertising was started already.";
+    error_callback();
+    return;
+  }
+
+  context_->GetFastInitiationManager().StartAdvertising(
+      ::nearby::api::FastInitBleBeacon::FastInitType(type),
+      [&, callback = std::move(callback)]() { callback(); },
+      [&, error_callback =
+              std::move(error_callback)](FastInitiationManager::Error error) {
+        AdvertisingErrorCodeCallbackHandler(error);
+        error_callback();
+      });
+}
+
+void NearbyFastInitiationImpl::StopAdvertising(std::function<void()> callback) {
+  if (!IsAdvertising()) {
+    NL_LOG(WARNING) << __func__ << ": FastInit BLE advertising is not running.";
+    callback();
+    return;
+  }
+
+  context_->GetFastInitiationManager().StopAdvertising(
+      [&, callback = std::move(callback)]() { callback(); });
+}
+
+void NearbyFastInitiationImpl::ScanningErrorCodeCallbackHandler(
+    FastInitiationManager::Error error) {
+  switch (error) {
+    case FastInitiationManager::Error::kBluetoothRadioUnavailable:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR) << __func__
+                    << ": FastInit BLE scanning failed due to bluetooth radio "
+                       "unavailable.";
+      break;
+    case FastInitiationManager::Error::kResourceInUse:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE scanning failed due to bluetooth resources are "
+             "in use/at full capacity.";
+      break;
+    case FastInitiationManager::Error::kDisabledByPolicy:
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE scanning failed due to being disabled by policy.";
+      break;
+    case FastInitiationManager::Error::kDisabledByUser:
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE scanning failed due to being disabled by user.";
+      break;
+    case FastInitiationManager::Error::kHardwareNotSupported:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE scanning failed due to hardware not supported.";
+      break;
+    case FastInitiationManager::Error::kTransportNotSupported:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE scanning failed due to transport not supported.";
+      break;
+    case FastInitiationManager::Error::kConsentRequired:
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE scanning failed due to consent required.";
+      break;
+    case FastInitiationManager::Error::kUnknown:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR) << __func__
+                    << ": FastInit BLE scanning failed due to unknown reasons.";
+      break;
+    default:
+      break;
+  }
+}
+
+void NearbyFastInitiationImpl::AdvertisingErrorCodeCallbackHandler(
+    FastInitiationManager::Error error) {
+  switch (error) {
+    case FastInitiationManager::Error::kBluetoothRadioUnavailable:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE advertising failed due to bluetooth radio "
+             "unavailable.";
+      break;
+    case FastInitiationManager::Error::kResourceInUse:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE advertising failed due to bluetooth resources are "
+             "in use/at full capacity.";
+      break;
+    case FastInitiationManager::Error::kDisabledByPolicy:
+      NL_LOG(ERROR) << __func__
+                    << ": FastInit BLE advertising failed due to being "
+                       "disabled by policy.";
+      break;
+    case FastInitiationManager::Error::kDisabledByUser:
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE advertising failed due to being disabled by user.";
+      break;
+    case FastInitiationManager::Error::kHardwareNotSupported:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE advertising failed due to hardware not supported.";
+      break;
+    case FastInitiationManager::Error::kTransportNotSupported:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR) << __func__
+                    << ": FastInit BLE advertising failed due to transport not "
+                       "supported.";
+      break;
+    case FastInitiationManager::Error::kConsentRequired:
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE advertising failed due to consent required.";
+      break;
+    case FastInitiationManager::Error::kUnknown:
+      for (Observer* observer : observer_list_.GetObservers()) {
+        if (observer != nullptr) {
+          observer->HardwareErrorReported(this);
+        }
+      }
+      NL_LOG(ERROR)
+          << __func__
+          << ": FastInit BLE advertising failed due to unknown reasons.";
+      break;
+    default:
+      break;
+  }
+}
+
+void NearbyFastInitiationImpl::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+  NL_LOG(INFO) << __func__ << ": Fast Initiation observer added.";
+}
+void NearbyFastInitiationImpl::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+  NL_LOG(INFO) << __func__ << ": Fast Initiation observer removed.";
+}
+bool NearbyFastInitiationImpl::HasObserver(Observer* observer) {
+  return observer_list_.HasObserver(observer);
+}
+
+}  // namespace sharing
+}  // namespace nearby
diff --git a/sharing/fast_initiation/nearby_fast_initiation_impl.h b/sharing/fast_initiation/nearby_fast_initiation_impl.h
new file mode 100644
index 00000000..4a21447b
--- /dev/null
+++ b/sharing/fast_initiation/nearby_fast_initiation_impl.h
@@ -0,0 +1,86 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_NEARBY_FAST_INITIATION_IMPL_H_
+#define THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_NEARBY_FAST_INITIATION_IMPL_H_
+
+#include <functional>
+#include <memory>
+
+#include "internal/base/observer_list.h"
+#include "sharing/fast_initiation/nearby_fast_initiation.h"
+#include "sharing/internal/api/fast_initiation_manager.h"
+#include "sharing/internal/public/context.h"
+
+namespace nearby {
+namespace sharing {
+
+class NearbyFastInitiationImpl : public NearbyFastInitiation {
+ public:
+  class Factory {
+   public:
+    static std::unique_ptr<NearbyFastInitiation> Create(Context* context);
+    static void SetFactoryForTesting(Factory* test_factory);
+
+   protected:
+    virtual ~Factory() = default;
+    virtual std::unique_ptr<NearbyFastInitiation> CreateInstance(
+        Context* context) = 0;
+
+   private:
+    static Factory* test_factory_;
+  };
+
+  explicit NearbyFastInitiationImpl(Context* context);
+
+  bool IsLowEnergySupported() override;
+  bool IsScanOffloadSupported() override;
+  bool IsAdvertisementOffloadSupported() override;
+
+  void StartScanning(std::function<void()> devices_discovered_callback,
+                     std::function<void()> devices_not_discovered_callback,
+                     std::function<void()> error_callback) override;
+
+  void StopScanning(std::function<void()> callback) override;
+
+  void StartAdvertising(FastInitType type, std::function<void()> callback,
+                        std::function<void()> error_callback) override;
+
+  void StopAdvertising(std::function<void()> callback) override;
+
+  bool IsScanning() const override;
+
+  bool IsAdvertising() const override;
+
+  void AddObserver(Observer* observer) override;
+  void RemoveObserver(Observer* observer) override;
+  bool HasObserver(Observer* observer) override;
+
+ private:
+  // Handle the scanning error codes and print out to logs
+  void ScanningErrorCodeCallbackHandler(
+      nearby::api::FastInitiationManager::Error error);
+
+  // Handle the advertising error codes and print out to logs
+  void AdvertisingErrorCodeCallbackHandler(
+      nearby::api::FastInitiationManager::Error error);
+
+  Context* const context_;
+  ObserverList<NearbyFastInitiation::Observer> observer_list_;
+};
+
+}  // namespace sharing
+}  // namespace nearby
+
+#endif  // THIRD_PARTY_NEARBY_SHARING_FAST_INITIATION_NEARBY_FAST_INITIATION_IMPL_H_
diff --git a/sharing/fast_initiation/nearby_fast_initiation_impl_test.cc b/sharing/fast_initiation/nearby_fast_initiation_impl_test.cc
new file mode 100644
index 00000000..0f14f7d2
--- /dev/null
+++ b/sharing/fast_initiation/nearby_fast_initiation_impl_test.cc
@@ -0,0 +1,240 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "sharing/fast_initiation/nearby_fast_initiation_impl.h"
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "gtest/gtest.h"
+#include "sharing/fast_initiation/fake_nearby_fast_initiation_observer.h"
+#include "sharing/fast_initiation/nearby_fast_initiation.h"
+#include "sharing/internal/api/fast_initiation_manager.h"
+#include "sharing/internal/test/fake_context.h"
+#include "sharing/internal/test/fake_fast_initiation_manager.h"
+
+namespace nearby {
+namespace sharing {
+namespace {
+
+TEST(NearbyFastInitiationImpl, IsLowEnergySupported) {
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  EXPECT_TRUE(nearby_fast_initiation_impl.IsLowEnergySupported());
+}
+
+TEST(NearbyFastInitiationImpl, IsScanOffloadSupported) {
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  EXPECT_TRUE(nearby_fast_initiation_impl.IsScanOffloadSupported());
+}
+
+TEST(NearbyFastInitiationImpl, IsAdvertisementOffloadSupported) {
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  EXPECT_TRUE(nearby_fast_initiation_impl.IsAdvertisementOffloadSupported());
+}
+
+TEST(NearbyFastInitiationImpl, HasObserverReturnsFalseAfterRemovingObserver) {
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  FakeNearbyFastInitiationObserver fake_observer(&nearby_fast_initiation_impl);
+
+  nearby_fast_initiation_impl.AddObserver(&fake_observer);
+  EXPECT_TRUE(nearby_fast_initiation_impl.HasObserver(&fake_observer));
+
+  nearby_fast_initiation_impl.RemoveObserver(&fake_observer);
+  EXPECT_FALSE(nearby_fast_initiation_impl.HasObserver(&fake_observer));
+}
+
+TEST(NearbyFastInitiationImpl, HasObserver) {
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  FakeNearbyFastInitiationObserver fake_observer(&nearby_fast_initiation_impl);
+
+  FakeNearbyFastInitiationObserver fake_observer_1(
+      &nearby_fast_initiation_impl);
+  FakeNearbyFastInitiationObserver fake_observer_2(
+      &nearby_fast_initiation_impl);
+
+  nearby_fast_initiation_impl.AddObserver(&fake_observer_1);
+
+  EXPECT_TRUE(nearby_fast_initiation_impl.HasObserver(&fake_observer_1));
+  EXPECT_FALSE(nearby_fast_initiation_impl.HasObserver(&fake_observer_2));
+}
+
+TEST(NearbyFastInitiationImpl, StartAdvertising) {
+  bool success_callback_called = false;
+  std::function<void()> success_callback = [&]() {
+    success_callback_called = true;
+  };
+  std::function<void()> error_callback = []() {};
+
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  nearby_fast_initiation_impl.StartAdvertising(
+      NearbyFastInitiation::FastInitType::kNotify, success_callback,
+      error_callback);
+  FakeFastInitiationManager& fake_fast_initiation_manager =
+      dynamic_cast<FakeFastInitiationManager&>(
+          fake_context->GetFastInitiationManager());
+  fake_fast_initiation_manager.SetAdvertisingStarted();
+  EXPECT_TRUE(success_callback_called);
+}
+
+TEST(NearbyFastInitiationImpl, StartAdvertisingAndGetHardwareError) {
+  bool error_callback_called = false;
+  std::function<void()> success_callback = []() {};
+  std::function<void()> error_callback = [&]() {
+    error_callback_called = true;
+  };
+
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+
+  FakeNearbyFastInitiationObserver fake_observer(&nearby_fast_initiation_impl);
+
+  nearby_fast_initiation_impl.AddObserver(&fake_observer);
+
+  nearby_fast_initiation_impl.StartAdvertising(
+      NearbyFastInitiation::FastInitType::kNotify, success_callback,
+      error_callback);
+
+  FakeFastInitiationManager& fake_fast_initiation_manager =
+      dynamic_cast<FakeFastInitiationManager&>(
+          fake_context->GetFastInitiationManager());
+
+  // Mocking OS hardware error event on Windows
+  fake_fast_initiation_manager.SetAdvertisingError(
+      nearby::api::FastInitiationManager::Error::kBluetoothRadioUnavailable);
+
+  EXPECT_TRUE(error_callback_called);
+  EXPECT_EQ(fake_observer.GetNumHardwareErrorReported(), 1);
+}
+
+TEST(NearbyFastInitiationImpl, StopAdvertisingNotStart) {
+  bool success_callback_called = false;
+  std::function<void()> success_callback = [&]() {
+    success_callback_called = true;
+  };
+
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  nearby_fast_initiation_impl.StopAdvertising(success_callback);
+  EXPECT_TRUE(success_callback_called);
+}
+
+TEST(NearbyFastInitiationImpl, StopStartedAdvertising) {
+  bool start_callback_called = false;
+  bool stop_callback_called = false;
+  auto fake_context = std::make_unique<FakeContext>();
+  FakeFastInitiationManager& fake_fast_initiation_manager =
+      dynamic_cast<FakeFastInitiationManager&>(
+          fake_context->GetFastInitiationManager());
+
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  nearby_fast_initiation_impl.StartAdvertising(
+      NearbyFastInitiation::FastInitType::kNotify,
+      [&]() { start_callback_called = true; }, [&]() {});
+  fake_fast_initiation_manager.SetAdvertisingStarted();
+  EXPECT_TRUE(start_callback_called);
+  EXPECT_TRUE(nearby_fast_initiation_impl.IsAdvertising());
+  nearby_fast_initiation_impl.StopAdvertising(
+      [&]() { stop_callback_called = true; });
+
+  fake_fast_initiation_manager.SetAdvertisingStopped();
+  EXPECT_TRUE(stop_callback_called);
+}
+
+TEST(NearbyFastInitiationImpl, StartScanningSucceed) {
+  bool devices_discovered = false;
+  std::function<void()> devices_discovered_callback = [&devices_discovered]() {
+    devices_discovered = true;
+  };
+  std::function<void()> devices_not_discovered_callback = []() {};
+  std::function<void()> error_callback = []() {};
+
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  nearby_fast_initiation_impl.StartScanning(devices_discovered_callback,
+                                            devices_not_discovered_callback,
+                                            error_callback);
+  FakeFastInitiationManager& fake_fast_initiation_manager =
+      dynamic_cast<FakeFastInitiationManager&>(
+          fake_context->GetFastInitiationManager());
+  fake_fast_initiation_manager.SetScanningDiscovered();
+  EXPECT_TRUE(devices_discovered);
+}
+
+TEST(NearbyFastInitiationImpl, StartScanningAndGetHardwareError) {
+  bool error_callback_called = false;
+  std::function<void()> devices_discovered_callback = []() {};
+  std::function<void()> devices_not_discovered_callback = []() {};
+  std::function<void()> error_callback = [&]() {
+    error_callback_called = true;
+  };
+
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+
+  FakeNearbyFastInitiationObserver fake_observer(&nearby_fast_initiation_impl);
+
+  nearby_fast_initiation_impl.AddObserver(&fake_observer);
+
+  nearby_fast_initiation_impl.StartScanning(devices_discovered_callback,
+                                            devices_not_discovered_callback,
+                                            error_callback);
+
+  FakeFastInitiationManager& fake_fast_initiation_manager =
+      dynamic_cast<FakeFastInitiationManager&>(
+          fake_context->GetFastInitiationManager());
+
+  // Mocking OS hardware error event on Windows
+  fake_fast_initiation_manager.SetScanningError(
+      nearby::api::FastInitiationManager::Error::kBluetoothRadioUnavailable);
+
+  EXPECT_TRUE(error_callback_called);
+  EXPECT_EQ(fake_observer.GetNumHardwareErrorReported(), 1);
+}
+
+TEST(NearbyFastInitiationImpl, StopScanningNotStart) {
+  bool stop_callback_called = false;
+  std::function<void()> success_callback = [&]() {
+    stop_callback_called = true;
+  };
+
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  nearby_fast_initiation_impl.StopScanning(success_callback);
+  EXPECT_TRUE(stop_callback_called);
+}
+
+TEST(NearbyFastInitiationImpl, StopStartedScanning) {
+  bool stop_callback_called = false;
+  auto fake_context = std::make_unique<FakeContext>();
+  NearbyFastInitiationImpl nearby_fast_initiation_impl(fake_context.get());
+  FakeFastInitiationManager& fake_fast_initiation_manager =
+      dynamic_cast<FakeFastInitiationManager&>(
+          fake_context->GetFastInitiationManager());
+  nearby_fast_initiation_impl.StartScanning([]() {}, []() {}, []() {});
+  nearby_fast_initiation_impl.StopScanning(
+      [&]() { stop_callback_called = true; });
+  fake_fast_initiation_manager.SetScanningStopped();
+  EXPECT_TRUE(stop_callback_called);
+}
+
+}  // namespace
+}  // namespace sharing
+}  // namespace nearby