diff --git a/.changeset/heavy-plants-doubt.md b/.changeset/heavy-plants-doubt.md
new file mode 100644
index 0000000000..3988a16752
--- /dev/null
+++ b/.changeset/heavy-plants-doubt.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-user-settings': patch
+---
+
+Added experimental support for declarative integration via the `/alpha` subpath.
diff --git a/.changeset/long-owls-complain.md b/.changeset/long-owls-complain.md
new file mode 100644
index 0000000000..f96b0f0987
--- /dev/null
+++ b/.changeset/long-owls-complain.md
@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-app-api': patch
+---
+
+Fixed an issue preventing the routing system to match subroutes
diff --git a/packages/app-next/src/App.tsx b/packages/app-next/src/App.tsx
index 01353feb4f..2ab447c68f 100644
--- a/packages/app-next/src/App.tsx
+++ b/packages/app-next/src/App.tsx
@@ -14,10 +14,17 @@
  * limitations under the License.
  */
 
+import React from 'react';
 import { createApp } from '@backstage/frontend-app-api';
 import { pagesPlugin } from './examples/pagesPlugin';
 import graphiqlPlugin from '@backstage/plugin-graphiql/alpha';
 import techRadarPlugin from '@backstage/plugin-tech-radar/alpha';
+import userSettingsPlugin from '@backstage/plugin-user-settings/alpha';
+import {
+  createExtensionOverrides,
+  createPageExtension,
+} from '@backstage/frontend-plugin-api';
+import { entityRouteRef } from '@backstage/plugin-catalog-react';
 
 /*
 
@@ -48,8 +55,23 @@ TODO:
 
 /* app.tsx */
 
+const entityPageExtension = createPageExtension({
+  id: 'catalog:entity',
+  defaultPath: '/catalog/:namespace/:kind/:name',
+  routeRef: entityRouteRef,
+  loader: async () => <div>Just a temporary mocked entity page</div>,
+});
+
 const app = createApp({
-  features: [graphiqlPlugin, pagesPlugin, techRadarPlugin],
+  features: [
+    graphiqlPlugin,
+    pagesPlugin,
+    techRadarPlugin,
+    userSettingsPlugin,
+    createExtensionOverrides({
+      extensions: [entityPageExtension],
+    }),
+  ],
   // bindRoutes({ bind }) {
   //   bind(catalogPlugin.externalRoutes, {
   //     createComponent: scaffolderPlugin.routes.root,
diff --git a/packages/app-next/src/examples/pagesPlugin.tsx b/packages/app-next/src/examples/pagesPlugin.tsx
index 1ec1cfa5a1..5ae1029769 100644
--- a/packages/app-next/src/examples/pagesPlugin.tsx
+++ b/packages/app-next/src/examples/pagesPlugin.tsx
@@ -50,6 +50,9 @@ const IndexPage = createPageExtension({
           <div>
             <Link to="/search">Search</Link>
           </div>
+          <div>
+            <Link to="/settings">Settings</Link>
+          </div>
         </div>
       );
     };
diff --git a/packages/frontend-app-api/src/extensions/CoreRoutes.tsx b/packages/frontend-app-api/src/extensions/CoreRoutes.tsx
index 5006a87cac..8d22b40eec 100644
--- a/packages/frontend-app-api/src/extensions/CoreRoutes.tsx
+++ b/packages/frontend-app-api/src/extensions/CoreRoutes.tsx
@@ -39,7 +39,7 @@ export const CoreRoutes = createExtension({
     const Routes = () => {
       const element = useRoutes(
         inputs.routes.map(route => ({
-          path: route.path,
+          path: `${route.path}/*`,
           element: route.element,
         })),
       );
diff --git a/packages/frontend-app-api/src/wiring/createApp.tsx b/packages/frontend-app-api/src/wiring/createApp.tsx
index 3999cad738..044eedfefd 100644
--- a/packages/frontend-app-api/src/wiring/createApp.tsx
+++ b/packages/frontend-app-api/src/wiring/createApp.tsx
@@ -76,6 +76,10 @@ import { overrideBaseUrlConfigs } from '../../../core-app-api/src/app/overrideBa
 // eslint-disable-next-line @backstage/no-relative-monorepo-imports
 import { RoutingProvider } from '../../../core-app-api/src/routing/RoutingProvider';
 // eslint-disable-next-line @backstage/no-relative-monorepo-imports
+import { AppLanguageSelector } from '../../../core-app-api/src/apis/implementations/AppLanguageApi/AppLanguageSelector';
+// eslint-disable-next-line @backstage/no-relative-monorepo-imports
+import { I18nextTranslationApi } from '../../../core-app-api/src/apis/implementations/TranslationApi/I18nextTranslationApi';
+// eslint-disable-next-line @backstage/no-relative-monorepo-imports
 import {
   apis as defaultApis,
   components as defaultComponents,
@@ -86,6 +90,10 @@ import { SidebarItem } from '@backstage/core-components';
 import { DarkTheme, LightTheme } from '../extensions/themes';
 import { extractRouteInfoFromInstanceTree } from '../routing/extractRouteInfoFromInstanceTree';
 import { getOrCreateGlobalSingleton } from '@backstage/version-bridge';
+import {
+  appLanguageApiRef,
+  translationApiRef,
+} from '@backstage/core-plugin-api/alpha';
 
 /** @public */
 export interface ExtensionTreeNode {
@@ -460,6 +468,21 @@ function createApiHolder(
     factory: () => configApi,
   });
 
+  factoryRegistry.register('static', {
+    api: appLanguageApiRef,
+    deps: {},
+    factory: () => AppLanguageSelector.createWithStorage(),
+  });
+
+  factoryRegistry.register('default', {
+    api: translationApiRef,
+    deps: { languageApi: appLanguageApiRef },
+    factory: ({ languageApi }) =>
+      I18nextTranslationApi.create({
+        languageApi,
+      }),
+  });
+
   // TODO: ship these as default extensions instead
   for (const factory of defaultApis as AnyApiFactory[]) {
     if (!factoryRegistry.register('app', factory)) {
diff --git a/plugins/user-settings/alpha-api-report.md b/plugins/user-settings/alpha-api-report.md
index 203cfac601..a4f41a729a 100644
--- a/plugins/user-settings/alpha-api-report.md
+++ b/plugins/user-settings/alpha-api-report.md
@@ -3,8 +3,17 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
+import { BackstagePlugin } from '@backstage/frontend-plugin-api';
+import { RouteRef } from '@backstage/core-plugin-api';
 import { TranslationRef } from '@backstage/core-plugin-api/alpha';
 
+// @alpha (undocumented)
+const _default: BackstagePlugin;
+export default _default;
+
+// @alpha (undocumented)
+export const userSettingsRouteRef: RouteRef<undefined>;
+
 // @alpha (undocumented)
 export const userSettingsTranslationRef: TranslationRef<
   'user-settings',
diff --git a/plugins/user-settings/package.json b/plugins/user-settings/package.json
index 6542137c0b..ea04370d41 100644
--- a/plugins/user-settings/package.json
+++ b/plugins/user-settings/package.json
@@ -7,13 +7,13 @@
   "license": "Apache-2.0",
   "exports": {
     ".": "./src/index.ts",
-    "./alpha": "./src/alpha.ts",
+    "./alpha": "./src/alpha.tsx",
     "./package.json": "./package.json"
   },
   "typesVersions": {
     "*": {
       "alpha": [
-        "src/alpha.ts"
+        "src/alpha.tsx"
       ],
       "package.json": [
         "package.json"
@@ -50,6 +50,7 @@
     "@backstage/core-components": "workspace:^",
     "@backstage/core-plugin-api": "workspace:^",
     "@backstage/errors": "workspace:^",
+    "@backstage/frontend-plugin-api": "workspace:^",
     "@backstage/plugin-catalog-react": "workspace:^",
     "@backstage/theme": "workspace:^",
     "@backstage/types": "workspace:^",
diff --git a/plugins/user-settings/src/alpha.ts b/plugins/user-settings/src/alpha.ts
deleted file mode 100644
index e1f7678bae..0000000000
--- a/plugins/user-settings/src/alpha.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright 2023 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.
- */
-export * from './translation';
diff --git a/plugins/user-settings/src/alpha.tsx b/plugins/user-settings/src/alpha.tsx
new file mode 100644
index 0000000000..8d68ccf259
--- /dev/null
+++ b/plugins/user-settings/src/alpha.tsx
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2023 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 { createRouteRef } from '@backstage/core-plugin-api';
+import {
+  coreExtensionData,
+  createExtensionInput,
+  createPageExtension,
+  createPlugin,
+} from '@backstage/frontend-plugin-api';
+
+import React from 'react';
+
+export * from './translation';
+
+/**
+ * @alpha
+ */
+export const userSettingsRouteRef = createRouteRef({
+  id: 'plugin.user-settings.page',
+});
+
+const UserSettingsPage = createPageExtension({
+  id: 'plugin.user-settings.page',
+  defaultPath: '/settings',
+  routeRef: userSettingsRouteRef,
+  inputs: {
+    providerSettings: createExtensionInput(
+      {
+        element: coreExtensionData.reactElement,
+      },
+      { singleton: true, optional: true },
+    ),
+  },
+  loader: ({ inputs }) =>
+    import('./components/SettingsPage').then(m => (
+      <m.SettingsPage providerSettings={inputs.providerSettings?.element} />
+    )),
+});
+
+/**
+ * @alpha
+ */
+export default createPlugin({
+  id: 'user-settings',
+  extensions: [UserSettingsPage],
+});
diff --git a/yarn.lock b/yarn.lock
index 5fa67f26cf..3b7aab4485 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9972,6 +9972,7 @@ __metadata:
     "@backstage/core-plugin-api": "workspace:^"
     "@backstage/dev-utils": "workspace:^"
     "@backstage/errors": "workspace:^"
+    "@backstage/frontend-plugin-api": "workspace:^"
     "@backstage/plugin-catalog": "workspace:^"
     "@backstage/plugin-catalog-react": "workspace:^"
     "@backstage/test-utils": "workspace:^"