diff --git a/packages/app/src/auth.tsx b/packages/app/src/auth.tsx
new file mode 100644
index 0000000000..e06df51754
--- /dev/null
+++ b/packages/app/src/auth.tsx
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2020 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { createApp } from '@backstage/app-defaults';
+import { AppRouter } from '@backstage/core-app-api';
+import {
+  AlertDisplay,
+  OAuthRequestDialog,
+  SignInPage,
+} from '@backstage/core-components';
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import { providers } from '../src/identityProviders';
+import {
+  configApiRef,
+  createApiFactory,
+  discoveryApiRef,
+} from '@backstage/core-plugin-api';
+import { AuthProxyDiscoveryApi } from '../src/AuthProxyDiscoveryApi';
+
+const app = createApp({
+  apis: [
+    createApiFactory({
+      api: discoveryApiRef,
+      deps: { configApi: configApiRef },
+      factory: ({ configApi }) => AuthProxyDiscoveryApi.fromConfig(configApi),
+    }),
+  ],
+  components: {
+    SignInPage: props => {
+      return (
+        <SignInPage
+          {...props}
+          providers={['guest', 'custom', ...providers]}
+          title="Select a sign-in method"
+          align="center"
+        />
+      );
+    },
+  },
+});
+
+function RedirectToRoot() {
+  window.location.pathname += '/..';
+  return <div />;
+}
+
+const App = app.createRoot(
+  <>
+    <AlertDisplay transientTimeoutMs={2500} />
+    <OAuthRequestDialog />
+    <AppRouter>
+      <RedirectToRoot />
+    </AppRouter>
+  </>,
+);
+
+ReactDOM.createRoot(document.getElementById('root')!).render(<App />);