diff --git a/api/__tests__/projects.test.ts b/api/__tests__/projects.test.ts
index b9dac3d..9c2920a 100644
--- a/api/__tests__/projects.test.ts
+++ b/api/__tests__/projects.test.ts
@@ -36,6 +36,8 @@ const createReadStreamMock = createReadStream as jest.MockedFunction<
   typeof createReadStream
 >;
 
+const httpPostMock = http.post as jest.MockedFunction<typeof http.post>;
+
 describe('api/projects', () => {
   const accountId = 999999;
   const projectId = 888888;
@@ -132,6 +134,51 @@ describe('api/projects', () => {
         headers: { 'Content-Type': 'multipart/form-data' },
       });
     });
+
+    it('should call the v3 api when optional intermediateRepresentation is provided', async () => {
+      // @ts-expect-error Wants full axios response
+      httpPostMock.mockResolvedValue({
+        data: {
+          createdBuildId: 123,
+        },
+      });
+
+      const intermediateRepresentation = {
+        intermediateNodesIndexedByUid: {
+          'calling-1': {
+            componentType: 'APP',
+            uid: 'calling-1',
+            config: {},
+            componentDeps: {},
+            files: {},
+          },
+        },
+      };
+
+      await uploadProject(
+        accountId,
+        projectName,
+        projectFile,
+        uploadMessage,
+        platformVersion,
+        intermediateRepresentation
+      );
+      expect(http.post).toHaveBeenCalledTimes(1);
+      expect(http.post).toHaveBeenCalledWith(accountId, {
+        url: `project-components-external/v3/upload/new-api`,
+        timeout: 60_000,
+        data: {
+          projectFilesZip: formData,
+          platformVersion,
+          uploadRequest: JSON.stringify({
+            ...intermediateRepresentation,
+            projectName,
+            buildMessage: uploadMessage,
+          }),
+        },
+        headers: { 'Content-Type': 'multipart/form-data' },
+      });
+    });
   });
 
   describe('fetchProject', () => {
diff --git a/api/projects.ts b/api/projects.ts
index dd90d71..3bb385f 100644
--- a/api/projects.ts
+++ b/api/projects.ts
@@ -8,6 +8,7 @@ import {
   ProjectSettings,
   FetchPlatformVersionResponse,
   WarnLogsResponse,
+  UploadIRResponse,
 } from '../types/Project';
 import { Build, FetchProjectBuildsResponse } from '../types/Build';
 import {
@@ -28,6 +29,8 @@ const PROJECTS_LOGS_API_PATH = 'dfs/logging/v1';
 const DEVELOPER_PROJECTS_API_PATH = 'developer/projects/v1';
 const MIGRATIONS_API_PATH = 'dfs/migrations/v1';
 
+const PROJECTS_V3_API_PATH = 'project-components-external/v3';
+
 export function fetchProjects(
   accountId: number
 ): HubSpotPromise<FetchProjectResponse> {
@@ -48,13 +51,38 @@ export function createProject(
   });
 }
 
-export function uploadProject(
+export async function uploadProject(
   accountId: number,
   projectName: string,
   projectFile: string,
   uploadMessage: string,
-  platformVersion?: string
-): HubSpotPromise<UploadProjectResponse> {
+  platformVersion?: string,
+  intermediateRepresentation?: unknown
+): HubSpotPromise<UploadProjectResponse | UploadIRResponse> {
+  if (intermediateRepresentation) {
+    const formData = {
+      projectFilesZip: fs.createReadStream(projectFile),
+      platformVersion,
+      uploadRequest: JSON.stringify({
+        ...intermediateRepresentation,
+        projectName,
+        buildMessage: uploadMessage,
+      }),
+    };
+
+    const response = await http.post<UploadIRResponse>(accountId, {
+      url: `${PROJECTS_V3_API_PATH}/upload/new-api`,
+      timeout: 60_000,
+      data: formData,
+      headers: { 'Content-Type': 'multipart/form-data' },
+    });
+
+    // Remap the response to match the expected shape
+    response.data.buildId = response.data.createdBuildId;
+
+    return response;
+  }
+
   const formData: FormData = {
     file: fs.createReadStream(projectFile),
     uploadMessage,
@@ -62,7 +90,6 @@ export function uploadProject(
   if (platformVersion) {
     formData.platformVersion = platformVersion;
   }
-
   return http.post<UploadProjectResponse>(accountId, {
     url: `${PROJECTS_API_PATH}/upload/${encodeURIComponent(projectName)}`,
     timeout: 60_000,
diff --git a/lib/fs.ts b/lib/fs.ts
index 56a7bc0..c3e6ce9 100644
--- a/lib/fs.ts
+++ b/lib/fs.ts
@@ -42,12 +42,13 @@ export function flattenAndRemoveSymlinks(
 
 const generateRecursiveFilePromise = async (
   dir: string,
-  file: string
+  file: string,
+  ignoreDirs?: string[]
 ): Promise<FileData> => {
   return getFileInfoAsync(dir, file).then(fileData => {
     return new Promise(resolve => {
       if (fileData.type === STAT_TYPES.DIRECTORY) {
-        walk(fileData.filepath).then(files => {
+        walk(fileData.filepath, ignoreDirs).then(files => {
           resolve({ ...fileData, files });
         });
       } else {
@@ -57,10 +58,17 @@ const generateRecursiveFilePromise = async (
   });
 };
 
-export async function walk(dir: string): Promise<Array<string>> {
+export async function walk(
+  dir: string,
+  ignoreDirs?: string[]
+): Promise<Array<string>> {
   function processFiles(files: Array<string>) {
+    // If the directory is in the ignore list, return an empty array to skip the directory contents
+    if (ignoreDirs?.some(ignored => dir.includes(ignored))) {
+      return [];
+    }
     return Promise.all(
-      files.map(file => generateRecursiveFilePromise(dir, file))
+      files.map(file => generateRecursiveFilePromise(dir, file, ignoreDirs))
     );
   }
 
diff --git a/types/Project.ts b/types/Project.ts
index 7835fd6..a30696d 100644
--- a/types/Project.ts
+++ b/types/Project.ts
@@ -38,6 +38,11 @@ export type UploadProjectResponse = {
   };
 };
 
+export type UploadIRResponse = {
+  buildId?: number;
+  createdBuildId: number;
+};
+
 export type ProjectSettings = {
   isAutoDeployEnabled: boolean;
 };