diff --git a/packages/node-experimental/src/sdk/hubextensions.ts b/packages/node-experimental/src/sdk/hubextensions.ts
new file mode 100644
index 000000000000..4971226fee01
--- /dev/null
+++ b/packages/node-experimental/src/sdk/hubextensions.ts
@@ -0,0 +1,80 @@
+import type { startTransaction } from '@sentry/core';
+import { addTracingExtensions as _addTracingExtensions, getMainCarrier } from '@sentry/core';
+import type { Breadcrumb, Hub, Transaction } from '@sentry/types';
+import { dateTimestampInSeconds } from '@sentry/utils';
+
+import type { TransactionWithBreadcrumbs } from '../types';
+
+const DEFAULT_MAX_BREADCRUMBS = 100;
+
+/**
+ * Add tracing extensions, ensuring a patched `startTransaction` to work with OTEL.
+ */
+export function addTracingExtensions(): void {
+  _addTracingExtensions();
+
+  const carrier = getMainCarrier();
+  if (!carrier.__SENTRY__) {
+    return;
+  }
+
+  carrier.__SENTRY__.extensions = carrier.__SENTRY__.extensions || {};
+  if (carrier.__SENTRY__.extensions.startTransaction) {
+    carrier.__SENTRY__.extensions.startTransaction = getPatchedStartTransaction(
+      carrier.__SENTRY__.extensions.startTransaction as typeof startTransaction,
+    );
+  }
+}
+
+/**
+ *  We patch the `startTransaction` function to ensure we create a `TransactionWithBreadcrumbs` instead of a regular `Transaction`.
+ */
+function getPatchedStartTransaction(_startTransaction: typeof startTransaction): typeof startTransaction {
+  return function (this: Hub, ...args) {
+    const transaction = _startTransaction.apply(this, args);
+
+    return patchTransaction(transaction);
+  };
+}
+
+function patchTransaction(transaction: Transaction): TransactionWithBreadcrumbs {
+  return new Proxy(transaction as TransactionWithBreadcrumbs, {
+    get(target, prop, receiver) {
+      if (prop === 'addBreadcrumb') {
+        return addBreadcrumb;
+      }
+      if (prop === 'getBreadcrumbs') {
+        return getBreadcrumbs;
+      }
+      if (prop === '_breadcrumbs') {
+        const breadcrumbs = Reflect.get(target, prop, receiver);
+        return breadcrumbs || [];
+      }
+      return Reflect.get(target, prop, receiver);
+    },
+  });
+}
+
+/** Add a breadcrumb to a transaction. */
+function addBreadcrumb(this: TransactionWithBreadcrumbs, breadcrumb: Breadcrumb, maxBreadcrumbs?: number): void {
+  const maxCrumbs = typeof maxBreadcrumbs === 'number' ? maxBreadcrumbs : DEFAULT_MAX_BREADCRUMBS;
+
+  // No data has been changed, so don't notify scope listeners
+  if (maxCrumbs <= 0) {
+    return;
+  }
+
+  const mergedBreadcrumb = {
+    timestamp: dateTimestampInSeconds(),
+    ...breadcrumb,
+  };
+
+  const breadcrumbs = this._breadcrumbs;
+  breadcrumbs.push(mergedBreadcrumb);
+  this._breadcrumbs = breadcrumbs.length > maxCrumbs ? breadcrumbs.slice(-maxCrumbs) : breadcrumbs;
+}
+
+/** Get all breadcrumbs from a transaction. */
+function getBreadcrumbs(this: TransactionWithBreadcrumbs): Breadcrumb[] {
+  return this._breadcrumbs;
+}
diff --git a/packages/node-experimental/src/sdk/scope.ts b/packages/node-experimental/src/sdk/scope.ts
index ab255f1d20bc..12fcc6862904 100644
--- a/packages/node-experimental/src/sdk/scope.ts
+++ b/packages/node-experimental/src/sdk/scope.ts
@@ -1,26 +1,9 @@
 import { Scope } from '@sentry/core';
-import type { Breadcrumb, Transaction } from '@sentry/types';
-import { dateTimestampInSeconds } from '@sentry/utils';
+import type { Breadcrumb } from '@sentry/types';
 
+import type { TransactionWithBreadcrumbs } from '../types';
 import { getActiveSpan } from './trace';
 
-const DEFAULT_MAX_BREADCRUMBS = 100;
-
-/**
- * This is a fork of the base Transaction with OTEL specific stuff added.
- * Note that we do not solve this via an actual subclass, but by wrapping this in a proxy when we need it -
- * as we can't easily control all the places a transaction may be created.
- */
-interface TransactionWithBreadcrumbs extends Transaction {
-  _breadcrumbs: Breadcrumb[];
-
-  /** Get all breadcrumbs added to this transaction. */
-  getBreadcrumbs(): Breadcrumb[];
-
-  /** Add a breadcrumb to this transaction. */
-  addBreadcrumb(breadcrumb: Breadcrumb, maxBreadcrumbs?: number): void;
-}
-
 /** A fork of the classic scope with some otel specific stuff. */
 export class OtelScope extends Scope {
   /**
@@ -54,7 +37,7 @@ export class OtelScope extends Scope {
   public addBreadcrumb(breadcrumb: Breadcrumb, maxBreadcrumbs?: number): this {
     const transaction = getActiveTransaction();
 
-    if (transaction) {
+    if (transaction && transaction.addBreadcrumb) {
       transaction.addBreadcrumb(breadcrumb, maxBreadcrumbs);
       return this;
     }
@@ -67,7 +50,7 @@ export class OtelScope extends Scope {
    */
   protected _getBreadcrumbs(): Breadcrumb[] {
     const transaction = getActiveTransaction();
-    const transactionBreadcrumbs = transaction ? transaction.getBreadcrumbs() : [];
+    const transactionBreadcrumbs = transaction && transaction.getBreadcrumbs ? transaction.getBreadcrumbs() : [];
 
     return this._breadcrumbs.concat(transactionBreadcrumbs);
   }
@@ -79,60 +62,5 @@ export class OtelScope extends Scope {
  */
 function getActiveTransaction(): TransactionWithBreadcrumbs | undefined {
   const activeSpan = getActiveSpan();
-  const transaction = activeSpan && activeSpan.transaction;
-
-  if (!transaction) {
-    return undefined;
-  }
-
-  if (transactionHasBreadcrumbs(transaction)) {
-    return transaction;
-  }
-
-  return new Proxy(transaction as TransactionWithBreadcrumbs, {
-    get(target, prop, receiver) {
-      if (prop === 'addBreadcrumb') {
-        return addBreadcrumb;
-      }
-      if (prop === 'getBreadcrumbs') {
-        return getBreadcrumbs;
-      }
-      if (prop === '_breadcrumbs') {
-        const breadcrumbs = Reflect.get(target, prop, receiver);
-        return breadcrumbs || [];
-      }
-      return Reflect.get(target, prop, receiver);
-    },
-  });
-}
-
-function transactionHasBreadcrumbs(transaction: Transaction): transaction is TransactionWithBreadcrumbs {
-  return (
-    typeof (transaction as TransactionWithBreadcrumbs).getBreadcrumbs === 'function' &&
-    typeof (transaction as TransactionWithBreadcrumbs).addBreadcrumb === 'function'
-  );
-}
-
-/** Add a breadcrumb to a transaction. */
-function addBreadcrumb(this: TransactionWithBreadcrumbs, breadcrumb: Breadcrumb, maxBreadcrumbs?: number): void {
-  const maxCrumbs = typeof maxBreadcrumbs === 'number' ? maxBreadcrumbs : DEFAULT_MAX_BREADCRUMBS;
-
-  // No data has been changed, so don't notify scope listeners
-  if (maxCrumbs <= 0) {
-    return;
-  }
-
-  const mergedBreadcrumb = {
-    timestamp: dateTimestampInSeconds(),
-    ...breadcrumb,
-  };
-
-  const breadcrumbs = this._breadcrumbs;
-  breadcrumbs.push(mergedBreadcrumb);
-  this._breadcrumbs = breadcrumbs.length > maxCrumbs ? breadcrumbs.slice(-maxCrumbs) : breadcrumbs;
-}
-
-/** Get all breadcrumbs from a transaction. */
-function getBreadcrumbs(this: TransactionWithBreadcrumbs): Breadcrumb[] {
-  return this._breadcrumbs;
+  return activeSpan && (activeSpan.transaction as TransactionWithBreadcrumbs | undefined);
 }
diff --git a/packages/node-experimental/src/types.ts b/packages/node-experimental/src/types.ts
index 107cfdb37266..65e3d905be72 100644
--- a/packages/node-experimental/src/types.ts
+++ b/packages/node-experimental/src/types.ts
@@ -1,5 +1,6 @@
 import type { Tracer } from '@opentelemetry/api';
 import type { NodeClient, NodeOptions } from '@sentry/node';
+import type { Breadcrumb, Transaction } from '@sentry/types';
 
 export type NodeExperimentalOptions = NodeOptions;
 export type NodeExperimentalClientOptions = ConstructorParameters<typeof NodeClient>[0];
@@ -8,3 +9,18 @@ export interface NodeExperimentalClient extends NodeClient {
   tracer: Tracer;
   getOptions(): NodeExperimentalClientOptions;
 }
+
+/**
+ * This is a fork of the base Transaction with OTEL specific stuff added.
+ * Note that we do not solve this via an actual subclass, but by wrapping this in a proxy when we need it -
+ * as we can't easily control all the places a transaction may be created.
+ */
+export interface TransactionWithBreadcrumbs extends Transaction {
+  _breadcrumbs: Breadcrumb[];
+
+  /** Get all breadcrumbs added to this transaction. */
+  getBreadcrumbs(): Breadcrumb[];
+
+  /** Add a breadcrumb to this transaction. */
+  addBreadcrumb(breadcrumb: Breadcrumb, maxBreadcrumbs?: number): void;
+}