diff --git a/apps/ngrx-notification/src/app/data-access/notification.service.ts b/apps/ngrx-notification/src/app/data-access/notification.service.ts
index d675e94..8f17cb6 100644
--- a/apps/ngrx-notification/src/app/data-access/notification.service.ts
+++ b/apps/ngrx-notification/src/app/data-access/notification.service.ts
@@ -1,31 +1,27 @@
-import { Injectable } from '@angular/core';
-import { filter } from 'rxjs';
-import { PushService } from '../backend/push.service';
-import { Push } from '../model/push.model';
-import { isStudent } from '../model/student.model';
-import { isTeacher } from '../model/teacher.model';
+import {
+  isStudent,
+  isTeacher,
+  Push,
+} from '@angular-challenges/ngrx-notification/model';
+import { inject, Injectable } from '@angular/core';
+import { PUSH_ACTION } from './notification.token';
 import { StudentStore } from './student.store';
 import { TeacherStore } from './teacher.store';
 
 @Injectable({ providedIn: 'root' })
 export class NotificationService {
-  constructor(
-    private pushService: PushService,
-    private teacherStore: TeacherStore,
-    private studentStore: StudentStore
-  ) {}
+  private notification$ = inject(PUSH_ACTION);
+  private teacherStore = inject(TeacherStore);
+  private studentStore = inject(StudentStore);
 
   init() {
-    this.pushService.notification$
-      .pipe(filter(Boolean))
-      .subscribe((notification: Push) => {
-        console.log(notification);
-        if (isTeacher(notification)) {
-          this.teacherStore.addOne(notification);
-        }
-        if (isStudent(notification)) {
-          this.studentStore.addOne(notification);
-        }
-      });
+    this.notification$.subscribe((notification: Push) => {
+      if (isTeacher(notification)) {
+        this.teacherStore.addOne(notification);
+      }
+      if (isStudent(notification)) {
+        this.studentStore.addOne(notification);
+      }
+    });
   }
 }
diff --git a/apps/ngrx-notification/src/app/data-access/notification.token.ts b/apps/ngrx-notification/src/app/data-access/notification.token.ts
new file mode 100644
index 0000000..da7d3c0
--- /dev/null
+++ b/apps/ngrx-notification/src/app/data-access/notification.token.ts
@@ -0,0 +1,12 @@
+import { PushService } from '@angular-challenges/ngrx-notification/backend';
+import { Push } from '@angular-challenges/ngrx-notification/model';
+import { inject, InjectionToken } from '@angular/core';
+import { filter, Observable, share } from 'rxjs';
+
+export const PUSH_ACTION = new InjectionToken<Observable<Push>>(
+  'Push messaging action stream',
+  {
+    factory: () =>
+      inject(PushService).notification$.pipe(filter(Boolean), share()),
+  }
+);
diff --git a/apps/ngrx-notification/src/app/data-access/student.store.ts b/apps/ngrx-notification/src/app/data-access/student.store.ts
index 7918118..5240c1f 100644
--- a/apps/ngrx-notification/src/app/data-access/student.store.ts
+++ b/apps/ngrx-notification/src/app/data-access/student.store.ts
@@ -1,6 +1,6 @@
+import { Student } from '@angular-challenges/ngrx-notification/model';
 import { Injectable } from '@angular/core';
 import { BehaviorSubject } from 'rxjs';
-import { Student } from '../model/student.model';
 
 @Injectable({
   providedIn: 'root',
diff --git a/apps/ngrx-notification/src/app/data-access/teacher.store.ts b/apps/ngrx-notification/src/app/data-access/teacher.store.ts
index 93f68c4..fee7e6e 100644
--- a/apps/ngrx-notification/src/app/data-access/teacher.store.ts
+++ b/apps/ngrx-notification/src/app/data-access/teacher.store.ts
@@ -1,6 +1,6 @@
+import { Teacher } from '@angular-challenges/ngrx-notification/model';
 import { Injectable } from '@angular/core';
 import { BehaviorSubject } from 'rxjs';
-import { Teacher } from '../model/teacher.model';
 
 @Injectable({
   providedIn: 'root',
diff --git a/apps/ngrx-notification/src/main.ts b/apps/ngrx-notification/src/main.ts
index 23644bb..4986c1c 100644
--- a/apps/ngrx-notification/src/main.ts
+++ b/apps/ngrx-notification/src/main.ts
@@ -1,8 +1,8 @@
 import { APP_INITIALIZER, enableProdMode, inject } from '@angular/core';
 import { bootstrapApplication } from '@angular/platform-browser';
 import { of } from 'rxjs';
+import { PushService } from '../../../libs/ngrx-notification/backend/src/lib/push.service';
 import { AppComponent } from './app/app.component';
-import { PushService } from './app/backend/push.service';
 import { NotificationService } from './app/data-access/notification.service';
 import { environment } from './environments/environment';
 
diff --git a/apps/ngrx-notification/tsconfig.editor.json b/apps/ngrx-notification/tsconfig.editor.json
index 0f9036b..7e16fb8 100644
--- a/apps/ngrx-notification/tsconfig.editor.json
+++ b/apps/ngrx-notification/tsconfig.editor.json
@@ -1,7 +1,10 @@
 {
   "extends": "./tsconfig.json",
-  "include": ["**/*.ts"],
+  "include": [
+    "**/*.ts",
+    "../../libs/ngrx-notification/backend/src/lib/push.service.ts"
+  ],
   "compilerOptions": {
     "types": []
   }
-}
+}
\ No newline at end of file
diff --git a/libs/ngrx-notification/backend/.eslintrc.json b/libs/ngrx-notification/backend/.eslintrc.json
new file mode 100644
index 0000000..946116f
--- /dev/null
+++ b/libs/ngrx-notification/backend/.eslintrc.json
@@ -0,0 +1,36 @@
+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "extends": [
+        "plugin:@nrwl/nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "angularChallenges",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "angular-challenges",
+            "style": "kebab-case"
+          }
+        ]
+      }
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nrwl/nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}
diff --git a/libs/ngrx-notification/backend/README.md b/libs/ngrx-notification/backend/README.md
new file mode 100644
index 0000000..637ceb1
--- /dev/null
+++ b/libs/ngrx-notification/backend/README.md
@@ -0,0 +1,7 @@
+# ngrx-notification-backend
+
+This library was generated with [Nx](https://nx.dev).
+
+## Running unit tests
+
+Run `nx test ngrx-notification-backend` to execute the unit tests.
diff --git a/libs/ngrx-notification/backend/jest.config.ts b/libs/ngrx-notification/backend/jest.config.ts
new file mode 100644
index 0000000..be62390
--- /dev/null
+++ b/libs/ngrx-notification/backend/jest.config.ts
@@ -0,0 +1,22 @@
+/* eslint-disable */
+export default {
+  displayName: 'ngrx-notification-backend',
+  preset: '../../../jest.preset.js',
+  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
+  globals: {
+    'ts-jest': {
+      tsconfig: '<rootDir>/tsconfig.spec.json',
+      stringifyContentPathRegex: '\\.(html|svg)$',
+    },
+  },
+  coverageDirectory: '../../../coverage/libs/ngrx-notification/backend',
+  transform: {
+    '^.+\\.(ts|mjs|js|html)$': 'jest-preset-angular',
+  },
+  transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
+  snapshotSerializers: [
+    'jest-preset-angular/build/serializers/no-ng-attributes',
+    'jest-preset-angular/build/serializers/ng-snapshot',
+    'jest-preset-angular/build/serializers/html-comment',
+  ],
+};
diff --git a/libs/ngrx-notification/backend/project.json b/libs/ngrx-notification/backend/project.json
new file mode 100644
index 0000000..eeb1e49
--- /dev/null
+++ b/libs/ngrx-notification/backend/project.json
@@ -0,0 +1,27 @@
+{
+  "name": "ngrx-notification-backend",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "library",
+  "sourceRoot": "libs/ngrx-notification/backend/src",
+  "prefix": "angular-challenges",
+  "targets": {
+    "test": {
+      "executor": "@nrwl/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "libs/ngrx-notification/backend/jest.config.ts",
+        "passWithNoTests": true
+      }
+    },
+    "lint": {
+      "executor": "@nrwl/linter:eslint",
+      "options": {
+        "lintFilePatterns": [
+          "libs/ngrx-notification/backend/**/*.ts",
+          "libs/ngrx-notification/backend/**/*.html"
+        ]
+      }
+    }
+  },
+  "tags": []
+}
diff --git a/libs/ngrx-notification/backend/src/index.ts b/libs/ngrx-notification/backend/src/index.ts
new file mode 100644
index 0000000..bf72113
--- /dev/null
+++ b/libs/ngrx-notification/backend/src/index.ts
@@ -0,0 +1 @@
+export * from './lib/push.service';
diff --git a/apps/ngrx-notification/src/app/backend/push.service.ts b/libs/ngrx-notification/backend/src/lib/push.service.ts
similarity index 76%
rename from apps/ngrx-notification/src/app/backend/push.service.ts
rename to libs/ngrx-notification/backend/src/lib/push.service.ts
index e7fe2be..c1fda14 100644
--- a/apps/ngrx-notification/src/app/backend/push.service.ts
+++ b/libs/ngrx-notification/backend/src/lib/push.service.ts
@@ -1,11 +1,16 @@
+import {
+  Push,
+  randStudent,
+  randTeacher,
+} from '@angular-challenges/ngrx-notification/model';
 import { Injectable } from '@angular/core';
 import { BehaviorSubject, tap, timer } from 'rxjs';
-import { randStudent } from '../model/student.model';
-import { randTeacher } from '../model/teacher.model';
 
 @Injectable({ providedIn: 'root' })
 export class PushService {
-  private notificationSubject = new BehaviorSubject<any>(undefined);
+  private notificationSubject = new BehaviorSubject<Push | undefined>(
+    undefined
+  );
   notification$ = this.notificationSubject.asObservable();
 
   init() {
diff --git a/libs/ngrx-notification/backend/src/test-setup.ts b/libs/ngrx-notification/backend/src/test-setup.ts
new file mode 100644
index 0000000..1100b3e
--- /dev/null
+++ b/libs/ngrx-notification/backend/src/test-setup.ts
@@ -0,0 +1 @@
+import 'jest-preset-angular/setup-jest';
diff --git a/libs/ngrx-notification/backend/tsconfig.json b/libs/ngrx-notification/backend/tsconfig.json
new file mode 100644
index 0000000..7504c34
--- /dev/null
+++ b/libs/ngrx-notification/backend/tsconfig.json
@@ -0,0 +1,28 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.lib.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    }
+  ],
+  "compilerOptions": {
+    "target": "es2020",
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}
diff --git a/libs/ngrx-notification/backend/tsconfig.lib.json b/libs/ngrx-notification/backend/tsconfig.lib.json
new file mode 100644
index 0000000..dd189dc
--- /dev/null
+++ b/libs/ngrx-notification/backend/tsconfig.lib.json
@@ -0,0 +1,17 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "declaration": true,
+    "declarationMap": true,
+    "inlineSources": true,
+    "types": []
+  },
+  "exclude": [
+    "src/test-setup.ts",
+    "**/*.spec.ts",
+    "jest.config.ts",
+    "**/*.test.ts"
+  ],
+  "include": ["**/*.ts"]
+}
diff --git a/libs/ngrx-notification/backend/tsconfig.spec.json b/libs/ngrx-notification/backend/tsconfig.spec.json
new file mode 100644
index 0000000..7aa46d8
--- /dev/null
+++ b/libs/ngrx-notification/backend/tsconfig.spec.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "module": "commonjs",
+    "types": ["jest", "node"]
+  },
+  "files": ["src/test-setup.ts"],
+  "include": ["jest.config.ts", "**/*.test.ts", "**/*.spec.ts", "**/*.d.ts"]
+}
diff --git a/libs/ngrx-notification/model/.eslintrc.json b/libs/ngrx-notification/model/.eslintrc.json
new file mode 100644
index 0000000..946116f
--- /dev/null
+++ b/libs/ngrx-notification/model/.eslintrc.json
@@ -0,0 +1,36 @@
+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "extends": [
+        "plugin:@nrwl/nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "angularChallenges",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "angular-challenges",
+            "style": "kebab-case"
+          }
+        ]
+      }
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nrwl/nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}
diff --git a/libs/ngrx-notification/model/README.md b/libs/ngrx-notification/model/README.md
new file mode 100644
index 0000000..1a547f2
--- /dev/null
+++ b/libs/ngrx-notification/model/README.md
@@ -0,0 +1,7 @@
+# ngrx-notification-model
+
+This library was generated with [Nx](https://nx.dev).
+
+## Running unit tests
+
+Run `nx test ngrx-notification-model` to execute the unit tests.
diff --git a/libs/ngrx-notification/model/jest.config.ts b/libs/ngrx-notification/model/jest.config.ts
new file mode 100644
index 0000000..a4d32f3
--- /dev/null
+++ b/libs/ngrx-notification/model/jest.config.ts
@@ -0,0 +1,22 @@
+/* eslint-disable */
+export default {
+  displayName: 'ngrx-notification-model',
+  preset: '../../../jest.preset.js',
+  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
+  globals: {
+    'ts-jest': {
+      tsconfig: '<rootDir>/tsconfig.spec.json',
+      stringifyContentPathRegex: '\\.(html|svg)$',
+    },
+  },
+  coverageDirectory: '../../../coverage/libs/ngrx-notification/model',
+  transform: {
+    '^.+\\.(ts|mjs|js|html)$': 'jest-preset-angular',
+  },
+  transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
+  snapshotSerializers: [
+    'jest-preset-angular/build/serializers/no-ng-attributes',
+    'jest-preset-angular/build/serializers/ng-snapshot',
+    'jest-preset-angular/build/serializers/html-comment',
+  ],
+};
diff --git a/libs/ngrx-notification/model/project.json b/libs/ngrx-notification/model/project.json
new file mode 100644
index 0000000..5f69b48
--- /dev/null
+++ b/libs/ngrx-notification/model/project.json
@@ -0,0 +1,27 @@
+{
+  "name": "ngrx-notification-model",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "library",
+  "sourceRoot": "libs/ngrx-notification/model/src",
+  "prefix": "angular-challenges",
+  "targets": {
+    "test": {
+      "executor": "@nrwl/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "libs/ngrx-notification/model/jest.config.ts",
+        "passWithNoTests": true
+      }
+    },
+    "lint": {
+      "executor": "@nrwl/linter:eslint",
+      "options": {
+        "lintFilePatterns": [
+          "libs/ngrx-notification/model/**/*.ts",
+          "libs/ngrx-notification/model/**/*.html"
+        ]
+      }
+    }
+  },
+  "tags": []
+}
diff --git a/libs/ngrx-notification/model/src/index.ts b/libs/ngrx-notification/model/src/index.ts
new file mode 100644
index 0000000..d81af44
--- /dev/null
+++ b/libs/ngrx-notification/model/src/index.ts
@@ -0,0 +1,3 @@
+export * from './lib/push.model';
+export * from './lib/student.model';
+export * from './lib/teacher.model';
diff --git a/apps/ngrx-notification/src/app/model/push.model.ts b/libs/ngrx-notification/model/src/lib/push.model.ts
similarity index 100%
rename from apps/ngrx-notification/src/app/model/push.model.ts
rename to libs/ngrx-notification/model/src/lib/push.model.ts
diff --git a/apps/ngrx-notification/src/app/model/student.model.ts b/libs/ngrx-notification/model/src/lib/student.model.ts
similarity index 100%
rename from apps/ngrx-notification/src/app/model/student.model.ts
rename to libs/ngrx-notification/model/src/lib/student.model.ts
diff --git a/apps/ngrx-notification/src/app/model/teacher.model.ts b/libs/ngrx-notification/model/src/lib/teacher.model.ts
similarity index 93%
rename from apps/ngrx-notification/src/app/model/teacher.model.ts
rename to libs/ngrx-notification/model/src/lib/teacher.model.ts
index 984a801..3fd5707 100644
--- a/apps/ngrx-notification/src/app/model/teacher.model.ts
+++ b/libs/ngrx-notification/model/src/lib/teacher.model.ts
@@ -24,7 +24,7 @@ export interface Teacher extends Push {
 
 const factoryTeacher = incrementalNumber();
 
-export const randTeacher = () => ({
+export const randTeacher = (): Teacher => ({
   id: factoryTeacher(),
   firstname: randFirstName(),
   lastname: randLastName(),
diff --git a/libs/ngrx-notification/model/src/test-setup.ts b/libs/ngrx-notification/model/src/test-setup.ts
new file mode 100644
index 0000000..1100b3e
--- /dev/null
+++ b/libs/ngrx-notification/model/src/test-setup.ts
@@ -0,0 +1 @@
+import 'jest-preset-angular/setup-jest';
diff --git a/libs/ngrx-notification/model/tsconfig.json b/libs/ngrx-notification/model/tsconfig.json
new file mode 100644
index 0000000..7504c34
--- /dev/null
+++ b/libs/ngrx-notification/model/tsconfig.json
@@ -0,0 +1,28 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.lib.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    }
+  ],
+  "compilerOptions": {
+    "target": "es2020",
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}
diff --git a/libs/ngrx-notification/model/tsconfig.lib.json b/libs/ngrx-notification/model/tsconfig.lib.json
new file mode 100644
index 0000000..dd189dc
--- /dev/null
+++ b/libs/ngrx-notification/model/tsconfig.lib.json
@@ -0,0 +1,17 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "declaration": true,
+    "declarationMap": true,
+    "inlineSources": true,
+    "types": []
+  },
+  "exclude": [
+    "src/test-setup.ts",
+    "**/*.spec.ts",
+    "jest.config.ts",
+    "**/*.test.ts"
+  ],
+  "include": ["**/*.ts"]
+}
diff --git a/libs/ngrx-notification/model/tsconfig.spec.json b/libs/ngrx-notification/model/tsconfig.spec.json
new file mode 100644
index 0000000..7aa46d8
--- /dev/null
+++ b/libs/ngrx-notification/model/tsconfig.spec.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "module": "commonjs",
+    "types": ["jest", "node"]
+  },
+  "files": ["src/test-setup.ts"],
+  "include": ["jest.config.ts", "**/*.test.ts", "**/*.spec.ts", "**/*.d.ts"]
+}
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 11253ac..e0ca0da 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -14,7 +14,14 @@
     "skipLibCheck": true,
     "skipDefaultLibCheck": true,
     "baseUrl": ".",
-    "paths": {}
+    "paths": {
+      "@angular-challenges/ngrx-notification/backend": [
+        "libs/ngrx-notification/backend/src/index.ts"
+      ],
+      "@angular-challenges/ngrx-notification/model": [
+        "libs/ngrx-notification/model/src/index.ts"
+      ]
+    }
   },
   "exclude": ["node_modules", "tmp"]
 }