diff --git a/libs/shell/header/src/index.ts b/libs/shell/header/src/index.ts
index 7278cb2cc..5dfa2dc65 100644
--- a/libs/shell/header/src/index.ts
+++ b/libs/shell/header/src/index.ts
@@ -1 +1 @@
-export * from './lib/shell-header/shell-header.component';
+export * from './lib/shell-header.component';
diff --git a/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.css b/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.css
new file mode 100644
index 000000000..9a6e2bb7c
--- /dev/null
+++ b/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.css
@@ -0,0 +1,15 @@
+.selector {
+  @apply relative flex rounded-full bg-isa-neutral-300;
+}
+
+.indicator {
+  @apply absolute top-0 size-12 rounded-full bg-isa-neutral-700 transition-transform duration-200 ease-out;
+}
+
+.option {
+  @apply relative flex h-12 w-12 cursor-pointer items-center justify-center transition-colors duration-200;
+}
+
+.option.selected {
+  @apply text-isa-neutral-300;
+}
diff --git a/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.html b/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.html
new file mode 100644
index 000000000..de9bad7ea
--- /dev/null
+++ b/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.html
@@ -0,0 +1,33 @@
+<fieldset
+  class="selector"
+  data-what="fieldset"
+  data-which="font-size-selector"
+  role="radiogroup"
+  aria-label="Schriftgröße auswählen"
+>
+  <div class="indicator" [style.transform]="'translateX(' + indicatorOffset() + 'rem)'"></div>
+
+  @for (option of fontSizeOptions; track option.value) {
+    <input
+      type="radio"
+      class="sr-only"
+      [id]="'font-size-' + option.value"
+      [value]="option.value"
+      name="font-size"
+      [ngModel]="fontSizeService.get()"
+      (ngModelChange)="onFontSizeChange($event)"
+      [attr.data-what]="'radio'"
+      [attr.data-which]="'font-size-' + option.value"
+    />
+    <label
+      class="option"
+      [for]="'font-size-' + option.value"
+      [class.selected]="fontSizeService.get() === option.value"
+      [attr.aria-label]="option.label"
+      [attr.data-what]="'label'"
+      [attr.data-which]="'font-size-label-' + option.value"
+    >
+      <ng-icon name="isaNavigationFontsize" [size]="option.iconSize" />
+    </label>
+  }
+</fieldset>
diff --git a/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.ts b/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.ts
new file mode 100644
index 000000000..73cf1f44a
--- /dev/null
+++ b/libs/shell/header/src/lib/components/font-size-selector/font-size-selector.component.ts
@@ -0,0 +1,56 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  computed,
+  inject,
+} from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { logger } from '@isa/core/logging';
+import { NgIcon, provideIcons } from '@ng-icons/core';
+import { isaNavigationFontsize } from '@isa/icons';
+import { FontSize, FontSizeService } from '@isa/shell/common';
+
+interface FontSizeOption {
+  value: FontSize;
+  label: string;
+  iconSize: string;
+}
+
+@Component({
+  selector: 'shell-font-size-selector',
+  templateUrl: './font-size-selector.component.html',
+  styleUrl: './font-size-selector.component.css',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [FormsModule, NgIcon],
+  providers: [
+    provideIcons({
+      isaNavigationFontsize,
+    }),
+  ],
+})
+export class ShellFontSizeSelectorComponent {
+  #logger = logger({ component: 'ShellFontSizeSelectorComponent' });
+
+  readonly fontSizeService = inject(FontSizeService);
+
+  readonly fontSizeOptions: FontSizeOption[] = [
+    { value: 'small', label: 'Kleine Schriftgröße', iconSize: '0.63rem' },
+    { value: 'medium', label: 'Mittlere Schriftgröße', iconSize: '1rem' },
+    { value: 'large', label: 'Große Schriftgröße', iconSize: '1.3rem' },
+  ];
+
+  readonly #offsetMap: Record<FontSize, number> = {
+    small: 0,
+    medium: 3,
+    large: 6,
+  };
+
+  readonly indicatorOffset = computed(
+    () => this.#offsetMap[this.fontSizeService.get()],
+  );
+
+  onFontSizeChange(size: FontSize): void {
+    this.#logger.debug('Font size changed', () => ({ size }));
+    this.fontSizeService.set(size);
+  }
+}
diff --git a/libs/shell/header/src/lib/components/logout-button.component.ts b/libs/shell/header/src/lib/components/logout-button.component.ts
new file mode 100644
index 000000000..b7171ae6d
--- /dev/null
+++ b/libs/shell/header/src/lib/components/logout-button.component.ts
@@ -0,0 +1,31 @@
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { logger } from '@isa/core/logging';
+import { InfoButtonComponent } from '@isa/ui/buttons';
+import { AuthService } from '@isa/core/auth';
+import { NgIcon, provideIcons } from '@ng-icons/core';
+import { isaNavigationLogout } from '@isa/icons';
+
+@Component({
+  selector: 'shell-logout-button',
+  template: `<ui-info-button
+    (click)="logout()"
+    data-what="button"
+    data-which="logout-button"
+    aria-label="Abmelden"
+  >
+    <ng-icon uiInfoButtonIcon name="isaNavigationLogout" />
+    <span class="isa-text-body-2-bold" uiInfoButtonLabel>NEU</span>
+  </ui-info-button>`,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [InfoButtonComponent, NgIcon],
+  providers: [provideIcons({ isaNavigationLogout })],
+})
+export class ShellLogoutButtonComponent {
+  #logger = logger({ component: 'ShellLogoutButtonComponent' });
+  #authService = inject(AuthService);
+
+  logout(): void {
+    this.#logger.info('User logging out');
+    this.#authService.logout();
+  }
+}
diff --git a/libs/shell/header/src/lib/components/navigation-toggle.component.ts b/libs/shell/header/src/lib/components/navigation-toggle.component.ts
new file mode 100644
index 000000000..c460621e9
--- /dev/null
+++ b/libs/shell/header/src/lib/components/navigation-toggle.component.ts
@@ -0,0 +1,56 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  computed,
+  inject,
+} from '@angular/core';
+import { logger } from '@isa/core/logging';
+import { isaActionClose, isaNavigationSidemenu } from '@isa/icons';
+import { NavigationService } from '@isa/shell/common';
+import {
+  IconButtonComponent,
+  IconButtonColor,
+  IconButtonSize,
+} from '@isa/ui/buttons';
+import { provideIcons } from '@ng-icons/core';
+
+@Component({
+  selector: 'shell-navigation-toggle',
+  template: `<ui-icon-button
+    [name]="iconName()"
+    [color]="IconButtonColor.Primary"
+    [size]="IconButtonSize.Large"
+    (click)="toggle()"
+    data-what="button"
+    data-which="navigation-toggle"
+    [attr.aria-label]="ariaLabel()"
+    [attr.aria-expanded]="navigationService.get()"
+  />`,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [IconButtonComponent],
+  providers: [provideIcons({ isaNavigationSidemenu, isaActionClose })],
+})
+export class ShellNavigationToggleComponent {
+  #logger = logger({ component: 'ShellNavigationToggleComponent' });
+
+  readonly navigationService = inject(NavigationService);
+
+  readonly IconButtonColor = IconButtonColor;
+  readonly IconButtonSize = IconButtonSize;
+
+  iconName = computed(() => {
+    const open = this.navigationService.get();
+    return open ? 'isaActionClose' : 'isaNavigationSidemenu';
+  });
+
+  ariaLabel = computed(() =>
+    this.navigationService.get() ? 'Menü schließen' : 'Menü öffnen',
+  );
+
+  toggle(): void {
+    this.navigationService.toggle();
+    this.#logger.debug('Navigation toggled', () => ({
+      isOpen: this.navigationService.get(),
+    }));
+  }
+}
diff --git a/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.css b/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.css
new file mode 100644
index 000000000..7e9537025
--- /dev/null
+++ b/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.css
@@ -0,0 +1,3 @@
+:host {
+  display: block;
+}
diff --git a/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.html b/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.html
new file mode 100644
index 000000000..a48535c40
--- /dev/null
+++ b/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.html
@@ -0,0 +1,36 @@
+<ui-icon-button
+  cdkOverlayOrigin
+  #trigger="cdkOverlayOrigin"
+  [name]="icon()"
+  [color]="IconButtonColor.Tertiary"
+  [size]="IconButtonSize.Large"
+  [disabled]="!hasNotifications()"
+  (click)="toggle()"
+  data-what="button"
+  data-which="notifications-toggle"
+  [attr.aria-label]="ariaLabel()"
+  [attr.aria-expanded]="isOpen()"
+  aria-haspopup="true"
+/>
+
+<ng-template
+  cdkConnectedOverlay
+  [cdkConnectedOverlayOrigin]="trigger"
+  [cdkConnectedOverlayOpen]="isOpen()"
+  [cdkConnectedOverlayPositions]="positions"
+  [cdkConnectedOverlayOffsetY]="12"
+  [cdkConnectedOverlayHasBackdrop]="true"
+  cdkConnectedOverlayBackdropClass="cdk-overlay-transparent-backdrop"
+  (backdropClick)="close()"
+  (detach)="close()"
+>
+  <div
+    class="p-4 bg-isa-white rounded-2xl max-h-96 overflow-y-auto shadow-lg"
+    data-what="panel"
+    data-which="notifications-panel"
+    role="dialog"
+    aria-label="Benachrichtigungen"
+  >
+    <shell-notifications />
+  </div>
+</ng-template>
diff --git a/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.ts b/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.ts
new file mode 100644
index 000000000..ccda25104
--- /dev/null
+++ b/libs/shell/header/src/lib/components/notifications-toggle/notifications-toggle.component.ts
@@ -0,0 +1,79 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  computed,
+  inject,
+  signal,
+} from '@angular/core';
+import { CdkConnectedOverlay, CdkOverlayOrigin, ConnectedPosition } from '@angular/cdk/overlay';
+import { logger } from '@isa/core/logging';
+import { isaNavigationMessage, isaNavigationMessageUnread } from '@isa/icons';
+import { provideIcons } from '@ng-icons/core';
+import {
+  IconButtonComponent,
+  IconButtonColor,
+  IconButtonSize,
+} from '@isa/ui/buttons';
+import { NotificationsService } from '@isa/shell/common';
+import { ShellNotificationsComponent } from '@isa/shell/notifications';
+
+@Component({
+  selector: 'shell-notifications-toggle',
+  templateUrl: './notifications-toggle.component.html',
+  styleUrl: './notifications-toggle.component.css',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [IconButtonComponent, ShellNotificationsComponent, CdkOverlayOrigin, CdkConnectedOverlay],
+  providers: [
+    provideIcons({ isaNavigationMessage, isaNavigationMessageUnread }),
+  ],
+})
+export class ShellNotificationsToggleComponent {
+  #logger = logger({ component: 'ShellNotificationsToggleComponent' });
+
+  readonly IconButtonColor = IconButtonColor;
+  readonly IconButtonSize = IconButtonSize;
+
+  readonly notificationsService = inject(NotificationsService);
+
+  isOpen = signal(false);
+
+  readonly positions: ConnectedPosition[] = [
+    // Bottom right
+    { originX: 'end', originY: 'bottom', overlayX: 'end', overlayY: 'top' },
+    // Bottom left
+    { originX: 'start', originY: 'bottom', overlayX: 'start', overlayY: 'top' },
+    // Left top
+    { originX: 'start', originY: 'top', overlayX: 'end', overlayY: 'top' },
+    // Left bottom
+    { originX: 'start', originY: 'bottom', overlayX: 'end', overlayY: 'bottom' },
+  ];
+
+  toggle(): void {
+    this.isOpen.update((open) => !open);
+    this.#logger.debug('Notifications panel toggled', () => ({
+      isOpen: this.isOpen(),
+    }));
+  }
+
+  close(): void {
+    this.isOpen.set(false);
+    this.#logger.debug('Notifications panel closed');
+  }
+
+  hasNotifications = computed(() => this.notificationsService.get().length > 0);
+
+  unreadNotifications = computed(
+    () => this.notificationsService.unreadCount() > 0,
+  );
+
+  icon = computed(() =>
+    this.unreadNotifications()
+      ? 'isaNavigationMessageUnread'
+      : 'isaNavigationMessage',
+  );
+
+  ariaLabel = computed(() => {
+    if (!this.hasNotifications()) return 'Keine Benachrichtigungen';
+    return this.isOpen() ? 'Benachrichtigungen schließen' : 'Benachrichtigungen öffnen';
+  });
+}
diff --git a/libs/shell/header/src/lib/shell-header/shell-header.component.css b/libs/shell/header/src/lib/shell-header.component.css
similarity index 100%
rename from libs/shell/header/src/lib/shell-header/shell-header.component.css
rename to libs/shell/header/src/lib/shell-header.component.css
diff --git a/libs/shell/header/src/lib/shell-header.component.html b/libs/shell/header/src/lib/shell-header.component.html
new file mode 100644
index 000000000..28f352c5e
--- /dev/null
+++ b/libs/shell/header/src/lib/shell-header.component.html
@@ -0,0 +1,14 @@
+<header
+  class="flex items-center gap-2 px-4 desktop:px-6 py-2 bg-isa-white shadow-[0_2px_6px_0_rgba(0,0,0,0.1)]"
+  data-what="header"
+  data-which="shell-header"
+  role="banner"
+>
+  @if (isTablet()) {
+    <shell-navigation-toggle />
+  }
+  <div class="grow"></div>
+  <shell-font-size-selector />
+  <shell-logout-button />
+  <shell-notifications-toggle />
+</header>
diff --git a/libs/shell/header/src/lib/shell-header.component.ts b/libs/shell/header/src/lib/shell-header.component.ts
new file mode 100644
index 000000000..5b601b4bb
--- /dev/null
+++ b/libs/shell/header/src/lib/shell-header.component.ts
@@ -0,0 +1,22 @@
+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { ShellNavigationToggleComponent } from './components/navigation-toggle.component';
+import { Breakpoint, breakpoint } from '@isa/ui/layout';
+import { ShellFontSizeSelectorComponent } from './components/font-size-selector/font-size-selector.component';
+import { ShellLogoutButtonComponent } from './components/logout-button.component';
+import { ShellNotificationsToggleComponent } from './components/notifications-toggle/notifications-toggle.component';
+
+@Component({
+  selector: 'shell-header',
+  templateUrl: './shell-header.component.html',
+  styleUrls: ['./shell-header.component.css'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [
+    ShellNavigationToggleComponent,
+    ShellFontSizeSelectorComponent,
+    ShellLogoutButtonComponent,
+    ShellNotificationsToggleComponent,
+  ],
+})
+export class ShellHeaderComponent {
+  readonly isTablet = breakpoint(Breakpoint.Tablet);
+}
diff --git a/libs/shell/header/src/lib/shell-header/shell-header.component.html b/libs/shell/header/src/lib/shell-header/shell-header.component.html
deleted file mode 100644
index b1709d9f4..000000000
--- a/libs/shell/header/src/lib/shell-header/shell-header.component.html
+++ /dev/null
@@ -1 +0,0 @@
-<p>ShellHeader works!</p>
diff --git a/libs/shell/header/src/lib/shell-header/shell-header.component.spec.ts b/libs/shell/header/src/lib/shell-header/shell-header.component.spec.ts
deleted file mode 100644
index 9c67c3779..000000000
--- a/libs/shell/header/src/lib/shell-header/shell-header.component.spec.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { ComponentFixture, TestBed } from '@angular/core/testing';
-import { ShellHeaderComponent } from './shell-header.component';
-
-describe('ShellHeaderComponent', () => {
-  let component: ShellHeaderComponent;
-  let fixture: ComponentFixture<ShellHeaderComponent>;
-
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      imports: [ShellHeaderComponent],
-    }).compileComponents();
-
-    fixture = TestBed.createComponent(ShellHeaderComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
-
-  it('should create', () => {
-    expect(component).toBeTruthy();
-  });
-});
diff --git a/libs/shell/header/src/lib/shell-header/shell-header.component.ts b/libs/shell/header/src/lib/shell-header/shell-header.component.ts
deleted file mode 100644
index b77b03d1e..000000000
--- a/libs/shell/header/src/lib/shell-header/shell-header.component.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { Component } from '@angular/core';
-import { CommonModule } from '@angular/common';
-
-@Component({
-  selector: 'shell-shell-header',
-  imports: [CommonModule],
-  templateUrl: './shell-header.component.html',
-  styleUrl: './shell-header.component.css',
-})
-export class ShellHeaderComponent {}