diff --git a/ReactAndroid/src/main/jni/react/jni/BUCK b/ReactAndroid/src/main/jni/react/jni/BUCK
index 7752dfb04e57c3..c6bfc5cea0225e 100644
--- a/ReactAndroid/src/main/jni/react/jni/BUCK
+++ b/ReactAndroid/src/main/jni/react/jni/BUCK
@@ -1,7 +1,6 @@
 load("//tools/build_defs/oss:rn_defs.bzl", "ANDROID", "FBJNI_TARGET", "IS_OSS_BUILD", "react_native_xplat_dep", "react_native_xplat_target", "rn_xplat_cxx_library")
 
 EXPORTED_HEADERS = [
-    "AndroidJSCFactory.h",
     "CxxModuleWrapper.h",
     "CxxModuleWrapperBase.h",
     "CxxSharedModuleWrapper.h",
@@ -52,6 +51,7 @@ rn_xplat_cxx_library(
     ],
     deps = ([
         "xplat//third-party/linker_lib:android",
+        "xplat//third-party/linker_lib:atomic",
         "xplat//folly:molly",
         "fbandroid//xplat/fbgloginit:fbgloginit",
         "xplat//fbsystrace:fbsystrace",
diff --git a/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp b/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp
index 290a61f9aa2f57..20b134a5c84375 100644
--- a/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp
+++ b/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp
@@ -9,7 +9,6 @@
 #include <fb/glog_init.h>
 #include <fb/log.h>
 
-#include "AndroidJSCFactory.h"
 #include "CatalystInstanceImpl.h"
 #include "CxxModuleWrapper.h"
 #include "JavaScriptExecutorHolder.h"
@@ -30,27 +29,6 @@ namespace react {
 
 namespace {
 
-// TODO: can we avoid these wrapper classes, and instead specialize the logic in CatalystInstanceImpl
-class JSCJavaScriptExecutorHolder : public HybridClass<JSCJavaScriptExecutorHolder,
-                                                       JavaScriptExecutorHolder> {
- public:
-  static constexpr auto kJavaDescriptor = "Lcom/facebook/react/bridge/JSCJavaScriptExecutor;";
-
-  static local_ref<jhybriddata> initHybrid(alias_ref<jclass>, ReadableNativeMap* jscConfig) {
-    return makeCxxInstance(makeAndroidJSCExecutorFactory(jscConfig->consume()));
-  }
-
-  static void registerNatives() {
-    registerHybrid({
-      makeNativeMethod("initHybrid", JSCJavaScriptExecutorHolder::initHybrid),
-    });
-  }
-
- private:
-  friend HybridBase;
-  using HybridBase::HybridBase;
-};
-
 struct JavaJSExecutor : public JavaClass<JavaJSExecutor> {
   static constexpr auto kJavaDescriptor = "Lcom/facebook/react/bridge/JavaJSExecutor;";
 };
@@ -83,7 +61,6 @@ class ProxyJavaScriptExecutorHolder : public HybridClass<ProxyJavaScriptExecutor
 extern "C" JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   return initialize(vm, [] {
     gloginit::initialize();
-    JSCJavaScriptExecutorHolder::registerNatives();
     ProxyJavaScriptExecutorHolder::registerNatives();
     CatalystInstanceImpl::registerNatives();
     CxxModuleWrapperBase::registerNatives();
diff --git a/ReactCommon/cxxreact/BUCK b/ReactCommon/cxxreact/BUCK
index e2712205822e79..d2fd1a1ff8cfb1 100644
--- a/ReactCommon/cxxreact/BUCK
+++ b/ReactCommon/cxxreact/BUCK
@@ -80,11 +80,8 @@ CXXREACT_PUBLIC_HEADERS = [
     "CxxNativeModule.h",
     "Instance.h",
     "JSBundleType.h",
-    "JSExecutor.h",
-    "JSCExecutor.h",
-    "JSCNativeModules.h",
-    "JSCUtils.h",
     "JSDeltaBundleClient.h",
+    "JSExecutor.h",
     "JSIndexedRAMBundle.h",
     "JSModulesUnbundle.h",
     "MessageQueueThread.h",
@@ -92,7 +89,6 @@ CXXREACT_PUBLIC_HEADERS = [
     "ModuleRegistry.h",
     "NativeModule.h",
     "NativeToJsBridge.h",
-    "Platform.h",
     "RAMBundleRegistry.h",
     "ReactMarker.h",
     "RecoverableError.h",
@@ -126,11 +122,7 @@ rn_xplat_cxx_library(
         "-frtti",
     ],
     fbandroid_deps = ANDROID_JSC_DEPS,
-    fbandroid_preprocessor_flags = get_android_inspector_flags() + [
-        "-DWITH_JSC_EXTRA_TRACING=1",
-        "-DWITH_JSC_MEMORY_PRESSURE=1",
-        "-DWITH_FB_MEMORY_PROFILING=1",
-    ],
+    fbandroid_preprocessor_flags = get_android_inspector_flags(),
     fbobjc_compiler_flags = get_apple_compiler_flags(),
     fbobjc_deps = APPLE_JSC_DEPS,
     fbobjc_force_static = True,
@@ -156,12 +148,10 @@ rn_xplat_cxx_library(
         "xplat//folly:molly",
         ":jsbigstring",
         ":module",
-        react_native_xplat_target("jschelpers:jschelpers"),
         react_native_xplat_target("jsinspector:jsinspector"),
         react_native_xplat_target("microprofiler:microprofiler"),
         "xplat//folly:optional",
         "xplat//third-party/glog:glog",
-        react_native_xplat_target("jschelpers:jscinternalhelpers"),
         react_native_xplat_target("privatedata:privatedata"),
     ],
 )
diff --git a/ReactCommon/cxxreact/tests/BUCK b/ReactCommon/cxxreact/tests/BUCK
index 37ef5228405372..c6dc902d652731 100644
--- a/ReactCommon/cxxreact/tests/BUCK
+++ b/ReactCommon/cxxreact/tests/BUCK
@@ -1,8 +1,6 @@
 load(
     "//tools/build_defs/oss:rn_defs.bzl",
-    "ANDROID_JSC_DEPS",
     "APPLE",
-    "APPLE_JSC_DEPS",
     "fb_xplat_cxx_test",
     "jni_instrumentation_test_lib",
     "react_native_xplat_target",
@@ -12,10 +10,7 @@ TEST_SRCS = [
     "RecoverableErrorTest.cpp",
     "jsarg_helpers.cpp",
     "jsbigstring.cpp",
-    "jscexecutor.cpp",
-    "jsclogging.cpp",
     "methodcall.cpp",
-    "value.cpp",
 ]
 
 jni_instrumentation_test_lib(
@@ -32,10 +27,11 @@ jni_instrumentation_test_lib(
         "fbandroid//instrumentation_tests/...",
     ],
     deps = [
-        "xplat//third-party/linker_lib:android",
         "xplat//third-party/gmock:gtest",
+        "xplat//third-party/linker_lib:android",
+        "xplat//third-party/linker_lib:atomic",
         react_native_xplat_target("cxxreact:bridge"),
-    ] + ANDROID_JSC_DEPS,
+    ],
 )
 
 fb_xplat_cxx_test(
@@ -53,6 +49,5 @@ fb_xplat_cxx_test(
         "xplat//folly:molly",
         "xplat//third-party/gmock:gtest",
         react_native_xplat_target("cxxreact:bridge"),
-        react_native_xplat_target("jschelpers:jschelpers"),
-    ] + APPLE_JSC_DEPS,
+    ],
 )
diff --git a/tools/build_defs/oss/rn_defs.bzl b/tools/build_defs/oss/rn_defs.bzl
index 379039303b9334..c4420b22e4ef13 100644
--- a/tools/build_defs/oss/rn_defs.bzl
+++ b/tools/build_defs/oss/rn_defs.bzl
@@ -22,8 +22,6 @@ GLOG_DEP = "//ReactAndroid/build/third-party-ndk/glog:glog"
 
 INSPECTOR_FLAGS = []
 
-APPLE_JSC_INTERNAL_DEPS = []
-
 APPLE_JSC_DEPS = []
 
 ANDROID_JSC_INTERNAL_DEPS = [