diff --git a/packages/react-native/ReactCommon/react/renderer/observers/events/CMakeLists.txt b/packages/react-native/ReactCommon/react/renderer/observers/events/CMakeLists.txt
index 02dcd45a190..44127354c96 100644
--- a/packages/react-native/ReactCommon/react/renderer/observers/events/CMakeLists.txt
+++ b/packages/react-native/ReactCommon/react/renderer/observers/events/CMakeLists.txt
@@ -20,6 +20,7 @@ target_link_libraries(react_renderer_observers_events
         react_renderer_runtimescheduler
         react_featureflags
         react_renderer_uimanager
-        react_utils)
+        react_utils
+        rrc_view)
 target_compile_reactnative_options(react_renderer_observers_events PRIVATE)
 target_compile_options(react_renderer_observers_events PRIVATE -Wpedantic)
diff --git a/packages/react-native/gradle/libs.versions.toml b/packages/react-native/gradle/libs.versions.toml
index 59db5cb8c22..7fd10e6ce94 100644
--- a/packages/react-native/gradle/libs.versions.toml
+++ b/packages/react-native/gradle/libs.versions.toml
@@ -47,6 +47,7 @@ fmt="11.0.2"
 folly="2024.11.18.00"
 glog="0.3.5"
 gflags="2.2.0"
+nlohmannjson="3.11.2"
 
 [libraries]
 androidx-annotation = { module = "androidx.annotation:annotation", version.ref = "androidx-annotation" }
diff --git a/private/react-native-fantom/build.gradle.kts b/private/react-native-fantom/build.gradle.kts
index 36ca5d6b79a..6b68d755ba0 100644
--- a/private/react-native-fantom/build.gradle.kts
+++ b/private/react-native-fantom/build.gradle.kts
@@ -15,7 +15,9 @@ plugins {
   alias(libs.plugins.download)
 }
 
+val FOLLY_VERSION = libs.versions.folly.get()
 val GFLAGS_VERSION = libs.versions.gflags.get()
+val NLOHMANNJSON_VERSION = libs.versions.nlohmannjson.get()
 
 val buildDir = project.layout.buildDirectory.get().asFile
 val downloadsDir =
@@ -27,6 +29,8 @@ val downloadsDir =
 val thirdParty = File("$buildDir/third-party")
 val reactNativeRootDir = projectDir.parentFile.parentFile
 val reactAndroidBuildDir = File("$reactNativeRootDir/packages/react-native/ReactAndroid/build")
+val reactAndroidDownloasdDir =
+    File("$reactNativeRootDir/packages/react-native/ReactAndroid/build/downloads")
 
 val createNativeDepsDirectories by
     tasks.registering {
@@ -34,6 +38,19 @@ val createNativeDepsDirectories by
       thirdParty.mkdirs()
     }
 
+val downloadFollyDest = File(reactAndroidDownloasdDir, "folly-${FOLLY_VERSION}.tar.gz")
+
+val prepareFolly by
+    tasks.registering(Copy::class) {
+      dependsOn(listOf(":packages:react-native:ReactAndroid:downloadFolly"))
+      from(tarTree(downloadFollyDest))
+      from("tester/third-party/folly/")
+      include("folly-${FOLLY_VERSION}/folly/**/*", "CMakeLists.txt")
+      eachFile { path = path.substringAfter("/") }
+      includeEmptyDirs = false
+      into("$thirdParty/folly")
+    }
+
 val downloadGflagsDest = File(downloadsDir, "gflags-${GFLAGS_VERSION}.tar.gz")
 val downloadGflags by
     tasks.registering(Download::class) {
@@ -55,16 +72,42 @@ val prepareGflags by
       outputDir.set(File(thirdParty, "gflags"))
     }
 
-var codegenSrcDir = File("$reactAndroidBuildDir/generated/source/codegen/jni/react")
-var codegenOutDir = File("$buildDir/codegen/react")
+val downloadNlohmannJsonDest = File(downloadsDir, "nlohmann_json-${NLOHMANNJSON_VERSION}.tar.gz")
+val downloadNlohmannJson by
+    tasks.registering(Download::class) {
+      dependsOn(createNativeDepsDirectories)
+      src("https://github.com/nlohmann/json/archive/v${NLOHMANNJSON_VERSION}.tar.gz")
+      onlyIfModified(true)
+      overwrite(false)
+      retries(5)
+      quiet(true)
+      dest(downloadNlohmannJsonDest)
+    }
+
+val prepareNlohmannJson by
+    tasks.registering(Copy::class) {
+      dependsOn(listOf(downloadNlohmannJson))
+      from(tarTree(downloadNlohmannJsonDest))
+      from("tester/third-party/nlohmann_json/")
+      include(
+          "json-${NLOHMANNJSON_VERSION}/src/**/*",
+          "json-${NLOHMANNJSON_VERSION}/include/**/*",
+          "CMakeLists.txt")
+      eachFile { path = path.substringAfter("/") }
+      includeEmptyDirs = false
+      into("$thirdParty/nlohmann_json")
+    }
+
+var codegenSrcDir = File("$reactAndroidBuildDir/generated/source/codegen/jni")
+var codegenOutDir = File("$buildDir/codegen")
 val prepareRNCodegen by
     tasks.registering(Copy::class) {
       dependsOn(":packages:react-native:ReactAndroid:generateCodegenArtifactsFromSchema")
       from(codegenSrcDir)
-      from("tester/codegen/react")
-      include(
-          "**/FBReactNativeSpecJSI.h", "**/FBReactNativeSpecJSI-generated.cpp", "CMakeLists.txt")
+      from("tester/codegen")
+      include("react/**/*.h", "react/**/*.cpp", "CMakeLists.txt")
       includeEmptyDirs = false
+      duplicatesStrategy = DuplicatesStrategy.INCLUDE
       into(codegenOutDir)
     }
 
@@ -80,7 +123,13 @@ val prepareNative3pDependencies by
     tasks.registering {
       dependsOn(
           prepareGflags,
-          ":packages:react-native:ReactAndroid:prepareNative3pDependencies",
+          prepareNlohmannJson,
+          prepareFolly,
+          ":packages:react-native:ReactAndroid:prepareBoost",
+          ":packages:react-native:ReactAndroid:prepareDoubleConversion",
+          ":packages:react-native:ReactAndroid:prepareFastFloat",
+          ":packages:react-native:ReactAndroid:prepareFmt",
+          ":packages:react-native:ReactAndroid:prepareGlog",
       )
     }
 
diff --git a/private/react-native-fantom/tester/CMakeLists.txt b/private/react-native-fantom/tester/CMakeLists.txt
index 850d70b400c..477a9ee262f 100644
--- a/private/react-native-fantom/tester/CMakeLists.txt
+++ b/private/react-native-fantom/tester/CMakeLists.txt
@@ -8,6 +8,7 @@ set(CMAKE_VERBOSE_MAKEFILE on)
 
 project(fantom_tester)
 find_library(LIB_HERMES libhermes
+  NAMES hermes
   HINTS ${REACT_ANDROID_DIR}/hermes-engine/build/hermes/API/hermes
   REQUIRED)
 # Ensure the library path is correct and the library exists
@@ -26,6 +27,8 @@ else()
   add_library(hermes-engine::libhermes ALIAS ${LIB_HERMES})
 endif()
 
+find_package(OpenSSL REQUIRED)
+
 include_directories(${REACT_ANDROID_DIR}/hermes-engine/build/prefab-headers)
 
 include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
@@ -42,16 +45,20 @@ add_react_third_party_ndk_subdir(glog)
 add_react_third_party_ndk_subdir(double-conversion)
 add_react_third_party_ndk_subdir(fast_float)
 add_react_third_party_ndk_subdir(fmt)
-add_react_third_party_ndk_subdir(folly)
+add_fantom_third_party_subdir(folly)
 add_fantom_third_party_subdir(gflags)
+add_fantom_third_party_subdir(nlohmann_json)
 
-add_fantom_codegen_subdir(react)
+add_subdirectory(${FANTOM_CODEGEN_DIR} codegen)
+
+add_library(glog_init INTERFACE)
 
-#add_react_common_subdir(hermes/executor)
-#add_react_common_subdir(hermes/inspector-modern)
-#add_react_common_subdir(react/runtime/hermes)
 add_react_common_subdir(callinvoker)
 add_react_common_subdir(cxxreact)
+add_react_common_subdir(devtoolsruntimesettings)
+add_react_common_subdir(hermes/executor)
+add_react_common_subdir(hermes/inspector-modern)
+add_react_common_subdir(jserrorhandler)
 add_react_common_subdir(jsi)
 add_react_common_subdir(jsiexecutor)
 add_react_common_subdir(jsinspector-modern)
@@ -64,32 +71,102 @@ add_react_common_subdir(oscompat)
 add_react_common_subdir(react/bridging)
 add_react_common_subdir(react/debug)
 add_react_common_subdir(react/featureflags)
+add_react_common_subdir(react/nativemodule/core)
+add_react_common_subdir(react/nativemodule/cputime)
+add_react_common_subdir(react/nativemodule/defaults)
+add_react_common_subdir(react/nativemodule/devtoolsruntimesettings)
+add_react_common_subdir(react/nativemodule/dom)
+add_react_common_subdir(react/nativemodule/fantomtestspecificmethods)
+add_react_common_subdir(react/nativemodule/featureflags)
+add_react_common_subdir(react/nativemodule/idlecallbacks)
+add_react_common_subdir(react/nativemodule/intersectionobserver)
+add_react_common_subdir(react/nativemodule/microtasks)
+add_react_common_subdir(react/nativemodule/mutationobserver)
+add_react_common_subdir(react/nativemodule/webperformance)
 add_react_common_subdir(react/performance/timeline)
+add_react_common_subdir(react/renderer/attributedstring)
+add_react_common_subdir(react/renderer/bridging)
+add_react_common_subdir(react/renderer/componentregistry)
+add_react_common_subdir(react/renderer/componentregistry/native)
+add_react_common_subdir(react/renderer/components/image)
+add_react_common_subdir(react/renderer/components/legacyviewmanagerinterop)
+add_react_common_subdir(react/renderer/components/modal)
+add_react_common_subdir(react/renderer/components/root)
+add_react_common_subdir(react/renderer/components/scrollview)
+add_react_common_subdir(react/renderer/components/text)
+add_react_common_subdir(react/renderer/components/view)
+add_react_common_subdir(react/renderer/consistency)
+add_react_common_subdir(react/renderer/core)
+add_react_common_subdir(react/renderer/css)
+add_react_common_subdir(react/renderer/debug)
+add_react_common_subdir(react/renderer/dom)
+add_react_common_subdir(react/renderer/graphics)
+add_react_common_subdir(react/renderer/imagemanager)
+add_react_common_subdir(react/renderer/leakchecker)
+add_react_common_subdir(react/renderer/mapbuffer)
+add_react_common_subdir(react/renderer/mounting)
+add_react_common_subdir(react/renderer/observers/events)
+add_react_common_subdir(react/renderer/observers/intersection)
+add_react_common_subdir(react/renderer/observers/mutation)
+add_react_common_subdir(react/renderer/runtimescheduler)
+add_react_common_subdir(react/renderer/scheduler)
+add_react_common_subdir(react/renderer/telemetry)
+add_react_common_subdir(react/renderer/textlayoutmanager)
+add_react_common_subdir(react/renderer/uimanager)
+add_react_common_subdir(react/renderer/uimanager/consistency)
+add_react_common_subdir(react/runtime)
+add_react_common_subdir(react/runtime/hermes)
 add_react_common_subdir(react/timing)
+add_react_common_subdir(react/utils)
 add_react_common_subdir(reactperflogger)
 add_react_common_subdir(runtimeexecutor)
 add_react_common_subdir(yoga)
 
-add_fantom_react_common_subdir(react/nativemodule/core)
-add_fantom_react_common_subdir(react/utils)
-add_fantom_react_common_subdir(react/runtime/hermes)
-add_fantom_react_common_subdir(hermes/inspector-modern)
-add_fantom_react_common_subdir(hermes/executor)
+# This is a hack to make sure that libraries that depend on jni yoga are linked
+add_library(yoga ALIAS yogacore)
 
-file(GLOB SOURCES "src/*.cpp" "src/*.h")
+add_react_cxx_platform_subdir(react/coremodules)
+add_react_cxx_platform_subdir(react/devsupport)
+add_react_cxx_platform_subdir(react/http)
+add_react_cxx_platform_subdir(react/io)
+add_react_cxx_platform_subdir(react/logging)
+add_react_cxx_platform_subdir(react/nativemodule)
+add_react_cxx_platform_subdir(react/profiling)
+add_react_cxx_platform_subdir(react/renderer/animated)
+add_react_cxx_platform_subdir(react/renderer/scheduler)
+add_react_cxx_platform_subdir(react/renderer/uimanager)
+add_react_cxx_platform_subdir(react/runtime)
+add_react_cxx_platform_subdir(react/threading)
+add_react_cxx_platform_subdir(react/utils)
+
+file(GLOB SOURCES src/*.cpp src/**/*.cpp)
 add_executable(fantom_tester ${SOURCES})
 
+target_include_directories(fantom_tester PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+
 target_link_libraries(fantom_tester
   PRIVATE
-    ${LIB_HERMES}
+    # third-party
     boost
-    bridgelesshermes
-    callinvoker
+    double-conversion
+    fmt
     folly_runtime
     gflags
     glog
+
+    # hermes
+    hermes-engine::libhermes
+
+    # codegen
+    react_codegen_rncore
+
+    # ReactCommon
+    bridgeless
+    bridgelesshermes
+    devtoolsruntimesettings
     hermes_executor_common
     hermes_inspector_modern
+    jserrorhandler
     jsi
     jsinspector
     jsinspector_cdp
@@ -100,17 +177,68 @@ target_link_libraries(fantom_tester
     logger
     oscompat
     react_bridging
-    react_codegen_rncore
     react_cxxreact
     react_debug
     react_featureflags
     react_nativemodule_core
+    react_nativemodule_cpu
+    react_nativemodule_defaults
+    react_nativemodule_devtoolsruntimesettings
+    react_nativemodule_dom
+    react_nativemodule_fantomspecificmethods
+    react_nativemodule_featureflags
+    react_nativemodule_idlecallbacks
+    react_nativemodule_intersectionobserver
+    react_nativemodule_microtasks
+    react_nativemodule_mutationobserver
+    react_nativemodule_webperformance
     react_performance_timeline
-    react_timing
+    react_renderer_attributedstring
+    react_renderer_componentregistry
+    react_renderer_consistency
+    react_renderer_core
+    react_renderer_css
+    react_renderer_debug
+    react_renderer_dom
+    react_renderer_graphics
+    react_renderer_imagemanager
+    react_renderer_leakchecker
+    react_renderer_mapbuffer
+    react_renderer_mounting
+    react_renderer_observers_events
+    react_renderer_observers_intersection
+    react_renderer_observers_mutation
+    react_renderer_runtimescheduler
+    react_renderer_scheduler
+    react_renderer_telemetry
+    react_renderer_textlayoutmanager
+    react_renderer_uimanager
+    react_renderer_uimanager_consistency
     react_utils
     reactperflogger
+    rrc_legacyviewmanagerinterop
+    rrc_image
+    rrc_modal
+    rrc_native
+    rrc_root
+    rrc_scrollview
+    rrc_text
+    rrc_view
     runtimeexecutor
     yogacore
+
+    # ReactCxxPlatform
+    react_cxx_platform_react_coremodules
+    react_cxx_platform_react_devsupport
+    react_cxx_platform_react_http
+    react_cxx_platform_react_io
+    react_cxx_platform_react_logging
+    react_cxx_platform_react_profiling
+    react_cxx_platform_react_renderer_animated
+    react_cxx_platform_react_renderer_scheduler
+    react_cxx_platform_react_runtime
+    react_cxx_platform_react_threading
+    react_cxx_platform_react_utils
 )
 
 target_compile_options(fantom_tester
diff --git a/private/react-native-fantom/tester/ReactCommon/hermes/executor/CMakeLists.txt b/private/react-native-fantom/tester/ReactCommon/hermes/executor/CMakeLists.txt
deleted file mode 100644
index 7b8d1dd59f6..00000000000
--- a/private/react-native-fantom/tester/ReactCommon/hermes/executor/CMakeLists.txt
+++ /dev/null
@@ -1,38 +0,0 @@
-# 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.
-
-cmake_minimum_required(VERSION 3.13)
-set(CMAKE_VERBOSE_MAKEFILE on)
-
-include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
-
-file(GLOB_RECURSE hermes_executor_SRC CONFIGURE_DEPENDS ${hermes_executor_DIR}/*.cpp)
-add_library(
-        hermes_executor_common
-        OBJECT
-        ${hermes_executor_SRC}
-)
-target_include_directories(hermes_executor_common PUBLIC ${hermes_executor_DIR}/.)
-target_link_libraries(hermes_executor_common
-        hermes-engine::libhermes
-        hermes_inspector_modern
-        jsi
-        jsireact
-)
-
-target_compile_reactnative_options(hermes_executor_common PRIVATE)
-if(${CMAKE_BUILD_TYPE} MATCHES Debug)
-        target_compile_options(
-                hermes_executor_common
-                PRIVATE
-                -DHERMES_ENABLE_DEBUGGER=1
-        )
-else()
-        target_compile_options(
-                hermes_executor_common
-                PRIVATE
-                -DNDEBUG
-        )
-endif()
diff --git a/private/react-native-fantom/tester/ReactCommon/hermes/inspector-modern/CMakeLists.txt b/private/react-native-fantom/tester/ReactCommon/hermes/inspector-modern/CMakeLists.txt
deleted file mode 100644
index 9d5127e0b7e..00000000000
--- a/private/react-native-fantom/tester/ReactCommon/hermes/inspector-modern/CMakeLists.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-# 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.
-
-cmake_minimum_required(VERSION 3.13)
-set(CMAKE_VERBOSE_MAKEFILE on)
-
-include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
-
-file(GLOB hermes_inspector_modern_SRC CONFIGURE_DEPENDS ${hermes_inspector_modern_DIR}/chrome/*.cpp)
-
-add_library(hermes_inspector_modern
-        OBJECT
-        ${hermes_inspector_modern_SRC})
-
-target_compile_reactnative_options(hermes_inspector_modern PRIVATE)
-
-if(${CMAKE_BUILD_TYPE} MATCHES Debug)
-        target_compile_options(
-                hermes_inspector_modern
-                PRIVATE
-                -DHERMES_ENABLE_DEBUGGER=1
-        )
-endif()
-
-target_include_directories(hermes_inspector_modern PUBLIC ${REACT_COMMON_DIR})
-target_link_libraries(hermes_inspector_modern
-        hermes-engine::libhermes
-        jsi
-        jsinspector)
diff --git a/private/react-native-fantom/tester/ReactCommon/react/nativemodule/core/CMakeLists.txt b/private/react-native-fantom/tester/ReactCommon/react/nativemodule/core/CMakeLists.txt
deleted file mode 100644
index ce8d950d50f..00000000000
--- a/private/react-native-fantom/tester/ReactCommon/react/nativemodule/core/CMakeLists.txt
+++ /dev/null
@@ -1,33 +0,0 @@
-# Copyright (c) Meta Platforms, Inc. and affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-cmake_minimum_required(VERSION 3.13)
-set(CMAKE_VERBOSE_MAKEFILE on)
-
-include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
-file(GLOB react_nativemodule_core_SRC CONFIGURE_DEPENDS
-        ${react_nativemodule_core_DIR}/ReactCommon/*.cpp)
-
-add_library(react_nativemodule_core
-        OBJECT
-        ${react_nativemodule_core_SRC})
-
-target_include_directories(react_nativemodule_core
-        PUBLIC
-          ${react_nativemodule_core_DIR}
-        )
-
-target_link_libraries(react_nativemodule_core
-        folly_runtime
-        glog
-        jsi
-        callinvoker
-        react_bridging
-        react_debug
-        react_utils
-        react_featureflags
-        reactperflogger)
-target_compile_reactnative_options(react_nativemodule_core PRIVATE)
-target_compile_options(react_nativemodule_core PRIVATE -Wpedantic)
diff --git a/private/react-native-fantom/tester/ReactCommon/react/runtime/hermes/CMakeLists.txt b/private/react-native-fantom/tester/ReactCommon/react/runtime/hermes/CMakeLists.txt
deleted file mode 100644
index 770744b5618..00000000000
--- a/private/react-native-fantom/tester/ReactCommon/react/runtime/hermes/CMakeLists.txt
+++ /dev/null
@@ -1,35 +0,0 @@
-# Copyright (c) Meta Platforms, Inc. and affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-cmake_minimum_required(VERSION 3.13)
-set(CMAKE_VERBOSE_MAKEFILE on)
-
-include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
-
-file(GLOB_RECURSE bridgelesshermes_SRC CONFIGURE_DEPENDS ${react_runtime_hermes_DIR}/*.cpp)
-add_library(
-        bridgelesshermes
-        OBJECT
-        ${bridgelesshermes_SRC}
-)
-target_include_directories(bridgelesshermes PUBLIC ${react_runtime_hermes_DIR}/.)
-
-target_link_libraries(bridgelesshermes
-        hermes-engine::libhermes
-        hermes_executor_common
-        hermes_inspector_modern
-        jsitooling
-        jsi
-        jsinspector
-)
-
-target_compile_reactnative_options(bridgelesshermes PRIVATE)
-if(${CMAKE_BUILD_TYPE} MATCHES Debug)
-        target_compile_options(
-                bridgelesshermes
-                PRIVATE
-                -DHERMES_ENABLE_DEBUGGER=1
-        )
-endif()
diff --git a/private/react-native-fantom/tester/ReactCommon/react/utils/CMakeLists.txt b/private/react-native-fantom/tester/ReactCommon/react/utils/CMakeLists.txt
deleted file mode 100644
index a2874202506..00000000000
--- a/private/react-native-fantom/tester/ReactCommon/react/utils/CMakeLists.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-# 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.
-
-cmake_minimum_required(VERSION 3.13)
-set(CMAKE_VERBOSE_MAKEFILE on)
-
-include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
-
-file(GLOB react_utils_SRC CONFIGURE_DEPENDS ${react_utils_DIR}/*.cpp)
-add_library(react_utils OBJECT ${react_utils_SRC})
-
-target_include_directories(react_utils
-        PUBLIC
-          ${REACT_COMMON_DIR}
-)
-
-target_link_libraries(react_utils
-        glog
-        jsireact
-        react_debug)
-target_compile_reactnative_options(react_utils PRIVATE)
-target_compile_options(react_utils PRIVATE -Wpedantic)
diff --git a/private/react-native-fantom/tester/build.sh b/private/react-native-fantom/tester/build.sh
index 7a3a0fffe8f..e37c65b6c99 100755
--- a/private/react-native-fantom/tester/build.sh
+++ b/private/react-native-fantom/tester/build.sh
@@ -7,36 +7,27 @@
 set -e
 
 SCRIPT_DIR=$(dirname "$(readlink -f "$0")")
-BUILD_DIR="$SCRIPT_DIR/build"
+BUILD_DIR="$SCRIPT_DIR/build/debug"
 REACT_NATIVE_ROOT_DIR=$(readlink -f "$SCRIPT_DIR/../../../packages/react-native")
 
+while getopts ":r" opt; do
+  case $opt in
+    r) release_build=true ;;
+    \?) ;;
+  esac
+done
+
+if [ "$release_build" = true ]; then
+  BUILD_DIR="$SCRIPT_DIR/build/release"
+fi
+
 cmake -S "$SCRIPT_DIR" -B "$BUILD_DIR" \
  -DREACT_ANDROID_DIR="${REACT_NATIVE_ROOT_DIR}/ReactAndroid" \
  -DFANTOM_THIRD_PARTY_DIR="${SCRIPT_DIR}/../build/third-party" \
  -DFANTOM_CODEGEN_DIR="${SCRIPT_DIR}/../build/codegen" \
  -DREACT_THIRD_PARTY_NDK_DIR="${REACT_NATIVE_ROOT_DIR}/ReactAndroid/build/third-party-ndk" \
- -DREACT_COMMON_DIR="${REACT_NATIVE_ROOT_DIR}/ReactCommon"
+ -DREACT_COMMON_DIR="${REACT_NATIVE_ROOT_DIR}/ReactCommon" \
+ -DREACT_CXX_PLATFORM_DIR="${REACT_NATIVE_ROOT_DIR}/ReactCxxPlatform" \
+ -DCMAKE_BUILD_TYPE="${release_build:+Release}${release_build:-Debug}"
 
 cmake --build "$BUILD_DIR" --target fantom_tester
-
-while getopts ":r" opt; do
-  case $opt in
-    r) execute_tester=true ;;
-    \?) ;;
-  esac
-done
-
-for arg in "$@"; do
-  if [ "$arg" = "--featureFlags" ]; then
-    feature_flags="--featureFlags=${@:$OPTIND:1}"
-    break
-  fi
-done
-
-if [ "$execute_tester" = true ]; then
-  if [ -n "$feature_flags" ]; then
-    "$BUILD_DIR/fantom_tester" "$feature_flags"
-  else
-    "$BUILD_DIR/fantom_tester"
-  fi
-fi
diff --git a/private/react-native-fantom/tester/cmake/modules/Deps.cmake b/private/react-native-fantom/tester/cmake/modules/Deps.cmake
index 008f7d19267..ec5d155d02c 100644
--- a/private/react-native-fantom/tester/cmake/modules/Deps.cmake
+++ b/private/react-native-fantom/tester/cmake/modules/Deps.cmake
@@ -6,6 +6,7 @@
 # Convert input paths to CMake format (with forward slashes)
 file(TO_CMAKE_PATH "${REACT_THIRD_PARTY_NDK_DIR}" REACT_THIRD_PARTY_NDK_DIR)
 file(TO_CMAKE_PATH "${REACT_COMMON_DIR}" REACT_COMMON_DIR)
+file(TO_CMAKE_PATH "${REACT_CXX_PLATFORM_DIR}" REACT_CXX_PLATFORM_DIR)
 file(TO_CMAKE_PATH "${FANTOM_CODEGEN_DIR}" FANTOM_CODEGEN_DIR)
 file(TO_CMAKE_PATH "${FANTOM_THIRD_PARTY_DIR}" FANTOM_THIRD_PARTY_DIR)
 
@@ -21,15 +22,8 @@ function(add_react_common_subdir relative_path)
   add_subdirectory(${REACT_COMMON_DIR}/${relative_path} ReactCommon/${relative_path})
 endfunction()
 
-function(add_fantom_codegen_subdir relative_path)
-  add_subdirectory(${FANTOM_CODEGEN_DIR}/${relative_path} ${relative_path})
-endfunction()
-
-function(add_fantom_react_common_subdir relative_path)
-  string(REPLACE "/" "_" var_name ${relative_path})
-  string(REPLACE "-" "_" var_name ${var_name})
-  set(${var_name}_DIR ${REACT_COMMON_DIR}/${relative_path})
-  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/ReactCommon/${relative_path} ReactCommon/${relative_path})
+function(add_react_cxx_platform_subdir relative_path)
+  add_subdirectory(${REACT_CXX_PLATFORM_DIR}/${relative_path} ReactCxxPlatform/${relative_path})
 endfunction()
 
 function(add_fantom_third_party_subdir relative_path)
diff --git a/private/react-native-fantom/tester/codegen/CMakeLists.txt b/private/react-native-fantom/tester/codegen/CMakeLists.txt
new file mode 100644
index 00000000000..368d3301460
--- /dev/null
+++ b/private/react-native-fantom/tester/codegen/CMakeLists.txt
@@ -0,0 +1,38 @@
+# 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.
+
+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+file(GLOB react_codegen_SRCS CONFIGURE_DEPENDS react/renderer/components/FBReactNativeSpec/*.cpp)
+
+add_library(
+  react_codegen_rncore
+  OBJECT
+  ${react_codegen_SRCS}
+)
+
+target_include_directories(react_codegen_rncore
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/.
+    ${CMAKE_CURRENT_SOURCE_DIR}/react/renderer/components/FBReactNativeSpec
+    ${CMAKE_CURRENT_SOURCE_DIR}/react/renderer/components)
+
+target_link_libraries(
+  react_codegen_rncore
+  jsi
+  react_nativemodule_core
+  rrc_view
+)
+
+target_compile_options(
+  react_codegen_rncore
+  PRIVATE
+  -DLOG_TAG=\"ReactNative\"
+  -fexceptions
+  -frtti
+  -std=c++20
+  -Wall
+)
diff --git a/private/react-native-fantom/tester/third-party/folly/CMakeLists.txt b/private/react-native-fantom/tester/third-party/folly/CMakeLists.txt
new file mode 100644
index 00000000000..e2af851f140
--- /dev/null
+++ b/private/react-native-fantom/tester/third-party/folly/CMakeLists.txt
@@ -0,0 +1,73 @@
+# 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.
+
+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+SET(folly_FLAGS
+        -DFOLLY_NO_CONFIG=1
+        -DFOLLY_HAVE_CLOCK_GETTIME=1
+        -DFOLLY_USE_LIBCPP=1
+        -DFOLLY_CFG_NO_COROUTINES=1
+        -DFOLLY_MOBILE=0
+        -DFOLLY_HAVE_RECVMMSG=1
+        -DFOLLY_HAVE_PTHREAD=1
+        # If APP_PLATFORM in Application.mk targets android-23 above, please comment
+        # the following line. NDK uses GNU style stderror_r() after API 23.
+        -DFOLLY_HAVE_XSI_STRERROR_R=1
+        )
+
+##################
+### folly_runtime ###
+##################
+
+SET(folly_runtime_SRC
+        folly/Conv.cpp
+        folly/Demangle.cpp
+        folly/FileUtil.cpp
+        folly/Format.cpp
+        folly/ScopeGuard.cpp
+        folly/SharedMutex.cpp
+        folly/String.cpp
+        folly/Unicode.cpp
+        folly/concurrency/CacheLocality.cpp
+        folly/container/detail/F14Table.cpp
+        folly/detail/FileUtilDetail.cpp
+        folly/detail/Futex.cpp
+        folly/detail/SplitStringSimd.cpp
+        folly/detail/UniqueInstance.cpp
+        folly/hash/SpookyHashV2.cpp
+        folly/io/IOBuf.cpp
+        folly/json/dynamic.cpp
+        folly/json/json_pointer.cpp
+        folly/json/json.cpp
+        folly/lang/CString.cpp
+        folly/lang/Exception.cpp
+        folly/lang/SafeAssert.cpp
+        folly/lang/ToAscii.cpp
+        folly/memory/SanitizeAddress.cpp
+        folly/memory/detail/MallocImpl.cpp
+        folly/net/NetOps.cpp
+        folly/portability/SysUio.cpp
+        folly/synchronization/SanitizeThread.cpp
+        folly/synchronization/ParkingLot.cpp
+        folly/system/AtFork.cpp
+        folly/system/ThreadId.cpp
+        folly/system/ThreadName.cpp)
+
+add_library(folly_runtime STATIC ${folly_runtime_SRC})
+
+target_compile_options(folly_runtime
+        PRIVATE
+        -fexceptions
+        -fno-omit-frame-pointer
+        -frtti
+        -Wno-sign-compare
+        ${folly_FLAGS})
+
+target_compile_options(folly_runtime PUBLIC ${folly_FLAGS})
+
+target_include_directories(folly_runtime PUBLIC .)
+target_link_libraries(folly_runtime glog double-conversion boost fmt fast_float)
diff --git a/private/react-native-fantom/tester/third-party/nlohmann_json/CMakeLists.txt b/private/react-native-fantom/tester/third-party/nlohmann_json/CMakeLists.txt
new file mode 100644
index 00000000000..5434507e586
--- /dev/null
+++ b/private/react-native-fantom/tester/third-party/nlohmann_json/CMakeLists.txt
@@ -0,0 +1,11 @@
+# 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.
+
+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+add_library(nlohmann_json INTERFACE)
+
+target_include_directories(nlohmann_json INTERFACE include)