diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 08aadb6..364c8b0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -266,6 +266,9 @@ importers:
       lucide-react:
         specifier: ^0.562.0
         version: 0.562.0(react@19.2.4)
+      monaco-editor:
+        specifier: ^0.55.1
+        version: 0.55.1
       react:
         specifier: ^19.2.0
         version: 19.2.4
diff --git a/web/package.json b/web/package.json
index 028a5cd..5ffedbe 100644
--- a/web/package.json
+++ b/web/package.json
@@ -28,6 +28,7 @@
     "@dnd-kit/utilities": "^3.2.2",
     "@monaco-editor/react": "^4.7.0",
     "lucide-react": "^0.562.0",
+    "monaco-editor": "^0.55.1",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-router-dom": "^7.14.2",
diff --git a/web/src/components/strategy/CodeStrategyEditor.dom.test.tsx b/web/src/components/strategy/CodeStrategyEditor.dom.test.tsx
index e171ef3..f2da623 100644
--- a/web/src/components/strategy/CodeStrategyEditor.dom.test.tsx
+++ b/web/src/components/strategy/CodeStrategyEditor.dom.test.tsx
@@ -9,6 +9,7 @@ const { createTradeProfileMock } = vi.hoisted(() => ({
 }));
 
 vi.mock('@monaco-editor/react', () => ({
+  loader: { config: vi.fn() },
   default: ({ value, onChange }: any) => (
     <textarea
       aria-label="strategy code"
@@ -18,6 +19,30 @@ vi.mock('@monaco-editor/react', () => ({
   ),
 }));
 
+vi.mock('monaco-editor', () => ({
+  editor: {},
+}));
+
+vi.mock('monaco-editor/esm/vs/editor/editor.worker?worker', () => ({
+  default: class MockEditorWorker {},
+}));
+
+vi.mock('monaco-editor/esm/vs/language/json/json.worker?worker', () => ({
+  default: class MockJsonWorker {},
+}));
+
+vi.mock('monaco-editor/esm/vs/language/css/css.worker?worker', () => ({
+  default: class MockCssWorker {},
+}));
+
+vi.mock('monaco-editor/esm/vs/language/html/html.worker?worker', () => ({
+  default: class MockHtmlWorker {},
+}));
+
+vi.mock('monaco-editor/esm/vs/language/typescript/ts.worker?worker', () => ({
+  default: class MockTsWorker {},
+}));
+
 vi.mock('../../lib/profileApi', () => ({
   createTradeProfile: (...args: any[]) => createTradeProfileMock(...args),
 }));
diff --git a/web/src/components/strategy/CodeStrategyEditor.tsx b/web/src/components/strategy/CodeStrategyEditor.tsx
index 1909a43..91a1482 100644
--- a/web/src/components/strategy/CodeStrategyEditor.tsx
+++ b/web/src/components/strategy/CodeStrategyEditor.tsx
@@ -6,6 +6,7 @@ import { Suspense, lazy, useCallback, useEffect, useRef, useState } from 'react'
 import { Play, Save, Copy, RotateCcw } from 'lucide-react';
 import { getPlatformAccessToken } from '../../lib/authSession';
 import { createTradeProfile } from '../../lib/profileApi';
+import '../../lib/monacoLocalWorkers';
 import { tradingRuntime } from '../../lib/runtime';
 import { createRequestId } from '../../../../shared/request-id.js';
 
diff --git a/web/src/lib/monacoLocalWorkers.ts b/web/src/lib/monacoLocalWorkers.ts
new file mode 100644
index 0000000..09d2ac3
--- /dev/null
+++ b/web/src/lib/monacoLocalWorkers.ts
@@ -0,0 +1,36 @@
+import { loader } from '@monaco-editor/react';
+import * as monaco from 'monaco-editor';
+import editorWorker from 'monaco-editor/esm/vs/editor/editor.worker?worker';
+import jsonWorker from 'monaco-editor/esm/vs/language/json/json.worker?worker';
+import cssWorker from 'monaco-editor/esm/vs/language/css/css.worker?worker';
+import htmlWorker from 'monaco-editor/esm/vs/language/html/html.worker?worker';
+import tsWorker from 'monaco-editor/esm/vs/language/typescript/ts.worker?worker';
+
+type MonacoWorkerConstructor = new () => Worker;
+
+const workerByLabel: Record<string, MonacoWorkerConstructor> = {
+  css: cssWorker,
+  handlebars: htmlWorker,
+  html: htmlWorker,
+  javascript: tsWorker,
+  json: jsonWorker,
+  less: cssWorker,
+  razor: htmlWorker,
+  scss: cssWorker,
+  typescript: tsWorker,
+};
+
+const monacoGlobal = globalThis as typeof globalThis & {
+  MonacoEnvironment?: {
+    getWorker: (_moduleId: string, label: string) => Worker;
+  };
+};
+
+monacoGlobal.MonacoEnvironment = {
+  getWorker(_moduleId: string, label: string) {
+    const WorkerConstructor = workerByLabel[label] ?? editorWorker;
+    return new WorkerConstructor();
+  },
+};
+
+loader.config({ monaco });
diff --git a/web/tsconfig.app.json b/web/tsconfig.app.json
index c66118d..47515e0 100644
--- a/web/tsconfig.app.json
+++ b/web/tsconfig.app.json
@@ -15,6 +15,15 @@
     "moduleDetection": "force",
     "noEmit": true,
     "jsx": "react-jsx",
+    "baseUrl": ".",
+    "paths": {
+      "monaco-editor": [
+        "../node_modules/.pnpm/monaco-editor@0.55.1/node_modules/monaco-editor/esm/vs/editor/editor.api"
+      ],
+      "monaco-editor/*": [
+        "../node_modules/.pnpm/monaco-editor@0.55.1/node_modules/monaco-editor/*"
+      ]
+    },
 
     /* Linting */
     "strict": true,
diff --git a/web/vite.config.ts b/web/vite.config.ts
index 5907f79..bcf7b9c 100644
--- a/web/vite.config.ts
+++ b/web/vite.config.ts
@@ -4,6 +4,11 @@ import tailwindcss from '@tailwindcss/vite'
 import path from 'node:path'
 import fs from 'node:fs'
 
+const monacoEditorPath = path.resolve(
+  __dirname,
+  '../node_modules/.pnpm/monaco-editor@0.55.1/node_modules/monaco-editor',
+);
+
 // Resolve a @bytelyst/* package: prefer web/node_modules, fall back to vendor/
 function bytelystAlias(pkg: string): string {
   const nmPath     = path.resolve(__dirname, 'node_modules/@bytelyst', pkg);
@@ -29,6 +34,12 @@ export default defineConfig({
       // Vendor packages that live only in vendor/ (not in web/node_modules/)
       { find: '@bytelyst/api-client',       replacement: bytelystAlias('api-client') },
       { find: '@bytelyst/errors',           replacement: bytelystAlias('errors') },
+      // Monaco is an explicit web dependency, but this workspace often runs
+      // against pnpm's root store without a web/node_modules symlink when the
+      // private mobile registry is unavailable. Keep local worker imports
+      // resolvable for Vite in that partially installed state.
+      { find: /^monaco-editor$/,            replacement: monacoEditorPath },
+      { find: /^monaco-editor\/(.+)/,       replacement: `${monacoEditorPath}/$1` },
       // General catch-all: every other @bytelyst/* → web/node_modules
       {
         find: /^@bytelyst\/(.+)/,