diff --git a/app/portal/page.tsx b/app/portal/page.tsx
index 0481b12..8907e97 100644
--- a/app/portal/page.tsx
+++ b/app/portal/page.tsx
@@ -1,6 +1,5 @@
 import { createClient } from "@/lib/supabase/server";
-import { Card, CardContent } from "poyraz-ui/atoms";
-import { Badge } from "poyraz-ui/molecules";
+import { Card, CardContent, Badge } from "poyraz-ui/atoms";
 import { FolderKanban, CheckCircle2, Clock, ArrowRight } from "lucide-react";
 import Link from "next/link";
 import { format } from "date-fns";
diff --git a/components/layout/portal-shell.tsx b/components/layout/portal-shell.tsx
index c520a00..1467cdb 100644
--- a/components/layout/portal-shell.tsx
+++ b/components/layout/portal-shell.tsx
@@ -10,10 +10,26 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "poyraz-ui/molecules";
-import { LogOut, User } from "lucide-react";
+import {
+  Sidebar,
+  SidebarBranding,
+  SidebarContent,
+  SidebarFooter,
+  SidebarHeader,
+  SidebarMenu,
+  SidebarMenuItem,
+  SidebarSection,
+  SidebarSeparator,
+  SidebarTrigger,
+  SidebarUserProfile,
+} from "poyraz-ui/organisms";
+import { portalSidebarData } from "@/config/portal-sidebar";
+import { cn } from "@/lib/utils";
+import { ChevronUp, LogOut, Menu, Settings } from "lucide-react";
 import Image from "next/image";
 import Link from "next/link";
 import { usePathname } from "next/navigation";
+import { useState } from "react";
 
 type PortalShellProps = {
   children: React.ReactNode;
@@ -27,65 +43,194 @@ type PortalShellProps = {
 
 export function PortalShell({ children, user }: PortalShellProps) {
   const pathname = usePathname();
+  const [isMobileSidebarOpen, setIsMobileSidebarOpen] = useState(false);
 
   return (
-    <div className="min-h-screen bg-background text-foreground flex flex-col">
-      <header className="sticky top-0 z-30 flex h-16 items-center justify-between border-b border-border bg-background/95 px-4 md:px-8 backdrop-blur">
-        <div className="flex items-center gap-6">
-          <Link href="/portal" className="flex items-center gap-2 font-semibold">
-            <Image
-              src="/logo/LogoWithBg.png"
-              alt="Cognis"
-              width={32}
-              height={32}
-              className="rounded-sm object-cover"
-              priority
+    <div className="min-h-screen bg-background text-foreground">
+      <div className="flex min-h-screen">
+        <aside className="sticky top-0 hidden h-dvh shrink-0 self-start border-r border-border bg-background lg:block">
+          <AppSidebar pathname={pathname} user={user} />
+        </aside>
+
+        {isMobileSidebarOpen ? (
+          <div className="fixed inset-0 z-50 lg:hidden">
+            <button
+              type="button"
+              aria-label="Menuyu kapat"
+              className="absolute inset-0 bg-overlay"
+              onClick={() => setIsMobileSidebarOpen(false)}
             />
-            Cognis Portal
-          </Link>
-          <nav className="hidden md:flex items-center gap-4 text-sm font-medium">
-            <Link 
-              href="/portal" 
-              className={`transition-colors hover:text-primary ${pathname === '/portal' ? 'text-primary' : 'text-muted-foreground'}`}
-            >
-              Dashboard
+            <aside className="relative h-dvh border-r border-border bg-background">
+              <AppSidebar
+                pathname={pathname}
+                user={user}
+                onNavigate={() => setIsMobileSidebarOpen(false)}
+              />
+            </aside>
+          </div>
+        ) : null}
+
+        <div className="flex flex-1 flex-col min-w-0">
+          <header className="sticky top-0 z-30 flex h-14 items-center justify-between border-b border-border bg-background/95 px-4 backdrop-blur lg:hidden">
+            <Link href="/portal" className="flex items-center gap-2 font-semibold">
+              <Image
+                src="/logo/LogoWithBg.png"
+                alt="Cognis"
+                width={32}
+                height={32}
+                className="rounded-sm object-cover"
+                priority
+              />
+              Cognis Portal
             </Link>
-          </nav>
-        </div>
+            <Button
+              type="button"
+              variant="outline"
+              className="h-9 w-9 p-0"
+              onClick={() => setIsMobileSidebarOpen(true)}
+            >
+              <Menu className="h-4 w-4" />
+            </Button>
+          </header>
 
-        <div className="flex items-center gap-4">
-          <DropdownMenu>
-            <DropdownMenuTrigger asChild>
-              <Button variant="ghost" className="h-9 w-9 rounded-full p-0 border border-border overflow-hidden">
-                {user.avatarUrl ? (
-                  <Image src={user.avatarUrl} alt={user.displayName} width={36} height={36} className="h-full w-full object-cover" />
-                ) : (
-                  <span className="text-xs font-medium">{user.shortName}</span>
-                )}
-              </Button>
-            </DropdownMenuTrigger>
-            <DropdownMenuContent align="end" className="w-56">
-              <DropdownMenuLabel className="font-normal">
-                <div className="flex flex-col space-y-1">
-                  <p className="text-sm font-medium leading-none">{user.displayName}</p>
-                  <p className="text-xs leading-none text-muted-foreground">
-                    {user.email}
-                  </p>
-                </div>
-              </DropdownMenuLabel>
-              <DropdownMenuSeparator />
-              <DropdownMenuItem className="text-rose-500" onClick={() => signOut()}>
-                <LogOut className="mr-2 h-4 w-4" />
-                Çıkış Yap
-              </DropdownMenuItem>
-            </DropdownMenuContent>
-          </DropdownMenu>
+          <main className="flex-1 p-4 lg:p-8 min-w-0">{children}</main>
         </div>
-      </header>
-
-      <main className="flex-1 w-full max-w-7xl mx-auto p-4 md:p-8">
-        {children}
-      </main>
+      </div>
     </div>
   );
 }
+
+function AppSidebar({
+  pathname,
+  user,
+  onNavigate,
+}: {
+  pathname: string;
+  user: PortalShellProps["user"];
+  onNavigate?: () => void;
+}) {
+  return (
+    <Sidebar
+      variant="bordered"
+      className="flex h-dvh max-h-dvh flex-col overflow-hidden rounded-none border-0"
+    >
+      <SidebarHeader className="shrink-0 border-b-0 px-6 py-6">
+        <SidebarBranding
+          title="Cognis"
+          subtitle="Client Portal"
+          logo={
+            <Image
+              src="/logo/LogoWithBg.png"
+              alt="Cognis"
+              width={36}
+              height={36}
+              className="h-9 w-9 rounded-sm object-cover"
+              priority
+            />
+          }
+        />
+      </SidebarHeader>
+
+      <SidebarSeparator className="mx-0 my-0 w-full" />
+
+      <SidebarContent className="tiny-scrollbar min-h-0 flex-1 overflow-y-auto px-6 py-6">
+        {portalSidebarData.map((group, groupIndex) => (
+          <div key={group.title}>
+            <SidebarSection title={group.title} defaultOpen className="mb-0">
+              <SidebarMenu>
+                {group.items.map((item) => {
+                  const isActive =
+                    item.href === "/portal"
+                      ? pathname === "/portal"
+                      : item.href
+                        ? pathname === item.href || pathname.startsWith(item.href + "/")
+                        : false;
+                  const Icon = item.icon;
+
+                  return (
+                    <SidebarMenuItem
+                      key={item.href || item.title}
+                      active={isActive}
+                      icon={Icon ? <Icon className="h-4 w-4" /> : undefined}
+                      className={cn(isActive && "font-semibold")}
+                    >
+                      <Link
+                        href={item.href || "#"}
+                        onClick={onNavigate}
+                        className="block w-full"
+                      >
+                        {item.title}
+                      </Link>
+                    </SidebarMenuItem>
+                  );
+                })}
+              </SidebarMenu>
+            </SidebarSection>
+            {groupIndex < portalSidebarData.length - 1 ? (
+              <SidebarSeparator className="-mx-6 my-5 w-[calc(100%+3rem)]" />
+            ) : null}
+          </div>
+        ))}
+      </SidebarContent>
+
+      <SidebarSeparator className="mx-0 my-0 w-full" />
+
+      <SidebarFooter className="shrink-0 border-t-0 px-6 py-5">
+        <DropdownMenu>
+          <DropdownMenuTrigger asChild>
+            <button
+              type="button"
+              className="w-full rounded-sm text-left outline-none transition-colors hover:bg-accent focus-visible:ring-2 focus-visible:ring-ring"
+            >
+              <div className="flex items-center gap-2">
+                <SidebarUserProfile
+                  name={user.displayName}
+                  role={user.email}
+                  avatarUrl={user.avatarUrl || undefined}
+                  initials={user.shortName}
+                  className="min-w-0 flex-1"
+                />
+                <ChevronUp className="mr-3 h-4 w-4 shrink-0 text-muted-foreground" />
+              </div>
+            </button>
+          </DropdownMenuTrigger>
+          <DropdownMenuContent
+            align="end"
+            side="right"
+            sideOffset={8}
+            className="w-64"
+          >
+            <DropdownMenuLabel className="font-normal">
+              <div className="flex flex-col gap-1">
+                <span className="truncate text-sm font-medium text-foreground">
+                  {user.displayName}
+                </span>
+                <span className="truncate text-xs text-muted-foreground">
+                  {user.email}
+                </span>
+              </div>
+            </DropdownMenuLabel>
+            <DropdownMenuSeparator />
+            <DropdownMenuItem asChild>
+              <Link href="/portal/settings" onClick={onNavigate} className="gap-2">
+                <Settings className="h-4 w-4" />
+                Ayarlar
+              </Link>
+            </DropdownMenuItem>
+            <DropdownMenuSeparator />
+            <form action={signOut}>
+              <DropdownMenuItem asChild>
+                <button type="submit" className="w-full gap-2">
+                  <LogOut className="h-4 w-4" />
+                  Çıkış yap
+                </button>
+              </DropdownMenuItem>
+            </form>
+          </DropdownMenuContent>
+        </DropdownMenu>
+      </SidebarFooter>
+
+      <SidebarTrigger className="hidden" />
+    </Sidebar>
+  );
+}
diff --git a/config/portal-sidebar.ts b/config/portal-sidebar.ts
new file mode 100644
index 0000000..f39edab
--- /dev/null
+++ b/config/portal-sidebar.ts
@@ -0,0 +1,25 @@
+import {
+  FolderKanban,
+  Sparkles,
+} from "lucide-react";
+
+export type PortalSidebarNavItem = {
+  title: string;
+  href?: string;
+  icon?: any;
+  items?: PortalSidebarNavItem[];
+};
+
+export type PortalSidebarNavGroup = {
+  title: string;
+  items: PortalSidebarNavItem[];
+};
+
+export const portalSidebarData: PortalSidebarNavGroup[] = [
+  {
+    title: "GENEL BAKIŞ",
+    items: [
+      { title: "Dashboard", href: "/portal", icon: Sparkles },
+    ],
+  },
+];