diff --git a/src/web/app.py b/src/web/app.py
index 7777299..7244ec7 100644
--- a/src/web/app.py
+++ b/src/web/app.py
@@ -4,7 +4,7 @@ from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
-from fastapi.responses import RedirectResponse
+from fastapi.responses import FileResponse, RedirectResponse
 from starlette.middleware.base import BaseHTTPMiddleware
 from starlette.middleware.gzip import GZipMiddleware
 from loguru import logger
@@ -104,6 +104,15 @@ app.add_middleware(GZipMiddleware, minimum_size=500)
 # Static files
 app.mount("/static", StaticFiles(directory=Path(__file__).parent / "static"), name="static")
 
+
+@app.get("/sw.js", include_in_schema=False)
+async def service_worker():
+    """Serve Service Worker from root scope so it can intercept all page requests."""
+    response = FileResponse(Path(__file__).parent / "static/sw.js", media_type="application/javascript")
+    response.headers["Service-Worker-Allowed"] = "/"
+    response.headers["Cache-Control"] = "no-cache"
+    return response
+
 # Include admin router (always available)
 app.include_router(admin_router)
 
diff --git a/src/web/static/sw.js b/src/web/static/sw.js
new file mode 100644
index 0000000..c213d09
--- /dev/null
+++ b/src/web/static/sw.js
@@ -0,0 +1,48 @@
+const CACHE_NAME = 'linkedin-shell-v1';
+const PRECACHE_URLS = [
+    '/static/tailwind.css',
+    '/static/tailwind-employee.css',
+    '/static/logo.png',
+    '/static/favicon.png',
+];
+
+self.addEventListener('install', function(event) {
+    event.waitUntil(
+        caches.open(CACHE_NAME).then(function(cache) {
+            return cache.addAll(PRECACHE_URLS);
+        }).then(function() {
+            return self.skipWaiting();
+        })
+    );
+});
+
+self.addEventListener('activate', function(event) {
+    event.waitUntil(
+        caches.keys().then(function(cacheNames) {
+            return Promise.all(
+                cacheNames
+                    .filter(function(name) { return name !== CACHE_NAME; })
+                    .map(function(name) { return caches.delete(name); })
+            );
+        }).then(function() {
+            return self.clients.claim();
+        })
+    );
+});
+
+self.addEventListener('fetch', function(event) {
+    if (!event.request.url.includes('/static/')) {
+        return;
+    }
+    event.respondWith(
+        caches.match(event.request).then(function(cached) {
+            return cached || fetch(event.request).then(function(response) {
+                var clone = response.clone();
+                caches.open(CACHE_NAME).then(function(cache) {
+                    cache.put(event.request, clone);
+                });
+                return response;
+            });
+        })
+    );
+});
diff --git a/src/web/templates/user/base.html b/src/web/templates/user/base.html
index 63ddf93..8267506 100644
--- a/src/web/templates/user/base.html
+++ b/src/web/templates/user/base.html
@@ -5,6 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>{% block title %}LinkedIn Posts{% endblock %}</title>
     <link rel="icon" type="image/png" href="/static/favicon.png">
+    <link rel="preload" href="/static/tailwind.css" as="style">
     <link rel="stylesheet" href="/static/tailwind.css">
     <style>
         body { background-color: #3d4848; }
@@ -362,5 +363,12 @@
     </script>
 
     {% block scripts %}{% endblock %}
+    <script>
+    if ('serviceWorker' in navigator) {
+        window.addEventListener('load', function() {
+            navigator.serviceWorker.register('/sw.js').catch(function() {});
+        });
+    }
+    </script>
 </body>
 </html>
diff --git a/src/web/templates/user/company_base.html b/src/web/templates/user/company_base.html
index c2ac30f..d690bb7 100644
--- a/src/web/templates/user/company_base.html
+++ b/src/web/templates/user/company_base.html
@@ -5,6 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>{% block title %}{{ session.company_name or 'Unternehmen' }} - LinkedIn Posts{% endblock %}</title>
     <link rel="icon" type="image/png" href="/static/favicon.png">
+    <link rel="preload" href="/static/tailwind.css" as="style">
     <link rel="stylesheet" href="/static/tailwind.css">
     <style>
         body { background-color: #3d4848; }
@@ -206,5 +207,12 @@
     </script>
 
     {% block scripts %}{% endblock %}
+    <script>
+    if ('serviceWorker' in navigator) {
+        window.addEventListener('load', function() {
+            navigator.serviceWorker.register('/sw.js').catch(function() {});
+        });
+    }
+    </script>
 </body>
 </html>