diff --git a/apps/backoffice/src/app/(protected)/layout.tsx b/apps/backoffice/src/app/(protected)/layout.tsx
index bc53fd2..78df939 100644
--- a/apps/backoffice/src/app/(protected)/layout.tsx
+++ b/apps/backoffice/src/app/(protected)/layout.tsx
@@ -1,13 +1,51 @@
-import { FC, ReactElement } from 'react';
+import { FC, ReactElement, useState } from 'react';
 import { Outlet } from 'react-router-dom';
 import { BackofficeSidebar } from '@imphnen-frontend-service/ui/organisms';
 
 export const AppLayout: FC = (): ReactElement => {
+  const [mobileSidebarOpen, setMobileSidebarOpen] = useState(false);
+
   return (
     <div className="bg-primary-50 min-h-screen flex justify-center">
       <div className="bg-primary-50 min-h-screen w-full flex">
-        <BackofficeSidebar />
+        <BackofficeSidebar
+          isOpen={mobileSidebarOpen}
+          onClose={() => setMobileSidebarOpen(false)}
+        />
         <div className="flex-1 overflow-auto">
+          {/* Sticky top header */}
+          <header
+            className={
+              'sticky top-0 bg-white border-b border-primary-200 px-4 py-3 flex items-center gap-3 ' +
+              (mobileSidebarOpen ? 'z-0' : 'z-30')
+            }
+          >
+            {/* Mobile menu button (shown on small screens) */}
+            <button
+              type="button"
+              className="md:hidden p-2 rounded-md hover:bg-gray-100 text-gray-700"
+              onClick={() => setMobileSidebarOpen(true)}
+              aria-label="Open sidebar"
+            >
+              <svg
+                className="w-5 h-5"
+                fill="none"
+                stroke="currentColor"
+                viewBox="0 0 24 24"
+              >
+                <path
+                  strokeLinecap="round"
+                  strokeLinejoin="round"
+                  strokeWidth={2}
+                  d="M4 6h16M4 12h16M4 18h16"
+                />
+              </svg>
+            </button>
+            <h1 className="text-p3 font-semibold text-primary-700">
+              IMPHNEN Backoffice
+            </h1>
+          </header>
+
           <Outlet />
         </div>
       </div>
diff --git a/apps/backoffice/src/index.css b/apps/backoffice/src/index.css
index a477593..fd9d7f2 100644
--- a/apps/backoffice/src/index.css
+++ b/apps/backoffice/src/index.css
@@ -130,7 +130,7 @@
   html {
     font-family: 'Bai Jamjuree', sans-serif;
     font-weight: 400;
-    font-size: 12px;
+    font-size: 14px;
     line-height: 1.2;
   }
-}
\ No newline at end of file
+}
diff --git a/libs/ui/src/organisms/backoffice-sidebar/backoffice-sidebar.tsx b/libs/ui/src/organisms/backoffice-sidebar/backoffice-sidebar.tsx
index 25079ee..fa28e11 100644
--- a/libs/ui/src/organisms/backoffice-sidebar/backoffice-sidebar.tsx
+++ b/libs/ui/src/organisms/backoffice-sidebar/backoffice-sidebar.tsx
@@ -3,91 +3,257 @@ import {
   AuditOutlined,
   BookOutlined,
   CommentOutlined,
+  DownOutlined,
   InboxOutlined,
   LogoutOutlined,
+  ReadOutlined,
   ReloadOutlined,
+  RightOutlined,
   ScheduleOutlined,
   SettingOutlined,
+  StockOutlined,
   UsergroupAddOutlined,
   UserOutlined,
   UserSwitchOutlined,
 } from '@ant-design/icons';
 import { Button } from '../../atoms';
-import { FC, ReactElement } from 'react';
+import { FC, ReactElement, useState } from 'react';
 import { Link, useLocation } from 'react-router-dom';
 import { cn, For, useSession } from '@imphnen-frontend-service/utils';
 
-const MENUS = [
+type MenuItem = {
+  label: string;
+  href?: string;
+  icon?: ReactElement;
+  children?: Array<{ label: string; href: string; icon?: ReactElement }>;
+};
+
+const MENUS: MenuItem[] = [
   {
-    label: 'Dashboard & Set Gacha',
-    href: '/dashboard',
-    icon: <AppstoreOutlined className="text-[20px]" />,
+    label: 'Hackathon',
+    icon: <StockOutlined className="text-p3" />,
+    children: [
+      {
+        label: 'Dashboard',
+        href: '/hackathon-dashboard',
+        icon: <AppstoreOutlined className="text-p3" />,
+      },
+      {
+        label: 'Users',
+        href: '/hackathon-users',
+        icon: <UserOutlined className="text-p3" />,
+      },
+      {
+        label: 'Teams',
+        href: '/hackathon-teams',
+        icon: <UsergroupAddOutlined className="text-p3" />,
+      },
+      {
+        label: 'Submissions',
+        href: '/hackathon-submissions',
+        icon: <AuditOutlined className="text-p3" />,
+      },
+    ],
   },
   {
-    label: 'Hackathon Dashboard',
-    href: '/hackathon-dashboard',
-    icon: <AppstoreOutlined className="text-p3" />,
+    label: 'Dimentorin',
+    icon: <ReadOutlined className="text-p3" />,
+    children: [
+      {
+        label: 'Dashboard - Dimentorin',
+        href: '/dashboard-dimentorin',
+        icon: <AppstoreOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'User - Dimentorin',
+        href: '/users-dimentorin',
+        icon: <UserSwitchOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Session - Dimentorin',
+        href: '/session-dimentorin',
+        icon: <ScheduleOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Content & Roadmap',
+        href: '/roadmap-dimentorin',
+        icon: <BookOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Feedback & Review',
+        href: '/feedback-review-dimentorin',
+        icon: <CommentOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Settings - Dimentorin',
+        href: '/settings-dimentorin',
+        icon: <SettingOutlined className="text-[20px]" />,
+      },
+    ],
   },
   {
-    label: 'Hackathon Users',
-    href: '/hackathon-users',
-    icon: <UserOutlined className="text-p3" />,
+    label: 'Gacha',
+    icon: <ReloadOutlined className="text-[20px]" />,
+    children: [
+      {
+        label: 'Dashboard & Set Gacha',
+        href: '/dashboard',
+        icon: <AppstoreOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Gacha Roll',
+        href: '/gacha-roll',
+        icon: <ReloadOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Validasi Transaksi',
+        href: '/transactions',
+        icon: <AuditOutlined className="text-[20px]" />,
+      },
+      {
+        label: 'Data Pengiriman Hadiah',
+        href: '/prizes',
+        icon: <InboxOutlined className="text-[20px]" />,
+      },
+    ],
   },
   {
-    label: 'Hackathon Teams',
-    href: '/hackathon-teams',
-    icon: <UsergroupAddOutlined className="text-p3" />,
+    label: 'Permissions',
+    href: '/permissions',
+    icon: <UserSwitchOutlined className="text-[20px]" />,
   },
   {
-    label: 'Hackathon Submissions',
-    href: '/hackathon-submissions',
-    icon: <AuditOutlined className="text-p3" />,
+    label: 'Roles',
+    href: '/roles',
+    icon: <UsergroupAddOutlined className="text-[20px]" />,
+  },
+  {
+    label: 'Data Akun',
+    href: '/accounts',
+    icon: <UserOutlined className="text-[20px]" />,
   },
-  // { label: 'Dashboard - Dimentorin', href: '/dashboard-dimentorin', icon: <AppstoreOutlined className="text-[20px]" /> },
-  // { label: 'Gacha Roll', href: '/gacha-roll', icon: <ReloadOutlined className="text-[20px]" /> },
-  // { label: 'Permissions', href: '/permissions', icon: <UserSwitchOutlined className="text-[20px]" /> },
-  // { label: 'Roles', href: '/roles', icon: <UsergroupAddOutlined className="text-[20px]" /> },
-  // { label: 'Data Akun', href: '/accounts', icon: <UserOutlined className="text-[20px]" /> },
-  // { label: 'Validasi Transaksi', href: '/transactions', icon: <AuditOutlined className="text-[20px]" /> },
-  // { label: 'Data Pengiriman Hadiah', href: '/prizes', icon: <InboxOutlined className="text-[20px]" /> },
-  // { label: 'User - Dimentorin', href: '/users-dimentorin', icon: <UserSwitchOutlined className="text-[20px]" /> },
-  // { label: 'Session - Dimentorin', href: '/session-dimentorin', icon: <ScheduleOutlined className="text-[20px]" /> },
-  // { label: 'Content & Roadmap', href: '/roadmap-dimentorin', icon: <BookOutlined className="text-[20px]" /> },
-  // { label: 'Feedback & Review', href: '/feedback-review-dimentorin', icon: <CommentOutlined className="text-[20px]" /> },
-  // { label: 'Settings - Dimentorin', href: '/settings-dimentorin', icon: <SettingOutlined className="text-[20px]" /> },
 ];
 
-export const BackofficeSidebar: FC = (): ReactElement => {
+interface SidebarProps {
+  isOpen?: boolean;
+  onClose?: () => void;
+}
+
+export const BackofficeSidebar: FC<SidebarProps> = ({
+  isOpen = false,
+  onClose,
+}): ReactElement => {
   const { signOut } = useSession();
   const location = useLocation();
+  const [openGroups, setOpenGroups] = useState<Record<string, boolean>>({});
   const isActive = (path: string) => {
     if (path === '/dashboard' && location.pathname === '/dashboard-dimentorin')
       return false;
     return location.pathname.includes(path);
   };
 
-  return (
-    <aside className="sticky top-0 left-0 w-[280px] bg-white h-svh py-[60px] px-[28px] shadow-xl flex flex-col justify-between">
-      <div className="flex flex-col gap-20 justify-between items-center">
-        <img src="/logos/simple.svg" alt="IMPHNEN Logo" className="w-[150px]" />
+  const toggleGroup = (groupLabel: string) => {
+    setOpenGroups((prev) => ({ ...prev, [groupLabel]: !prev[groupLabel] }));
+  };
+
+  const sidebarContent = (
+    <div className="w-[280px] bg-white h-svh py-10 md:py-[60px] px-7 shadow-xl flex flex-col justify-between">
+      <div className="flex flex-col gap-10 md:gap-20 justify-between items-center">
+        <div className="flex justify-between md:justify-center items-center w-full">
+          <img
+            src="/logos/simple.svg"
+            alt="IMPHNEN Logo"
+            className="w-[150px]"
+          />
+          {onClose && (
+            <button
+              onClick={onClose}
+              className="md:hidden p-2 rounded-lg hover:bg-gray-100 transition-colors cursor-pointer"
+              aria-label="Close sidebar"
+            >
+              <svg
+                className="w-5 h-5 text-gray-500"
+                fill="none"
+                stroke="currentColor"
+                viewBox="0 0 24 24"
+              >
+                <path
+                  strokeLinecap="round"
+                  strokeLinejoin="round"
+                  strokeWidth={2}
+                  d="M6 18L18 6M6 6l12 12"
+                />
+              </svg>
+            </button>
+          )}
+        </div>
 
         <nav className="flex flex-col gap-4 w-full h-[calc(100svh-20rem)] overflow-y-auto">
           <For data={MENUS}>
-            {({ label, href, icon }) => (
-              <Link
-                key={href}
-                to={href}
-                className={cn(
-                  'flex items-center justify-items-start gap-3 px-[8px] py-[10px]',
-                  isActive(href)
-                    ? 'bg-primary-500 text-white rounded-md'
-                    : 'text-gray-700 hover:bg-gray-100'
-                )}
-              >
-                {icon}
-                <span className="text-p3 font-medium">{label}</span>
-              </Link>
-            )}
+            {(menu) =>
+              menu.children && menu.children.length > 0 ? (
+                <div key={menu.label} className="w-full">
+                  <button
+                    type="button"
+                    onClick={() => toggleGroup(menu.label)}
+                    className={cn(
+                      'flex items-center justify-between w-full gap-3 px-2 py-2.5 rounded-md cursor-pointer',
+                      openGroups[menu.label]
+                        ? 'bg-primary-500 text-white'
+                        : 'text-gray-700 hover:bg-gray-100'
+                    )}
+                  >
+                    <div className="flex items-center gap-3">
+                      {menu.icon}
+                      <span className="text-p3 font-medium">{menu.label}</span>
+                    </div>
+                    <span className="text-label2">
+                      {openGroups[menu.label] ? (
+                        <DownOutlined className="text-label1" />
+                      ) : (
+                        <RightOutlined className="text-label1" />
+                      )}
+                    </span>
+                  </button>
+
+                  {openGroups[menu.label] && (
+                    <div className="mt-2 ml-6 flex flex-col gap-2">
+                      {menu.children.map((child) => (
+                        <Link
+                          key={child.href}
+                          to={child.href}
+                          className={cn(
+                            'flex items-center gap-3 px-2 py-2.5 rounded-md',
+                            isActive(child.href)
+                              ? 'bg-primary-100 text-primary-700'
+                              : 'text-gray-700 hover:bg-gray-100'
+                          )}
+                        >
+                          {child.icon}
+                          <span className="text-label1 font-medium">
+                            {child.label}
+                          </span>
+                        </Link>
+                      ))}
+                    </div>
+                  )}
+                </div>
+              ) : (
+                <Link
+                  key={menu.href ?? menu.label}
+                  to={menu.href ?? '#'}
+                  className={cn(
+                    'flex items-center justify-items-start gap-3 px-2 py-2.5',
+                    menu.href && isActive(menu.href)
+                      ? 'bg-primary-500 text-white rounded-md'
+                      : 'text-gray-700 hover:bg-gray-100'
+                  )}
+                >
+                  {menu.icon}
+                  <span className="text-p3 font-medium">{menu.label}</span>
+                </Link>
+              )
+            }
           </For>
         </nav>
       </div>
@@ -97,12 +263,36 @@ export const BackofficeSidebar: FC = (): ReactElement => {
         <Button
           onClick={signOut}
           variant="text"
-          className="items-start justify-start gap-3 px-[8px] py-[10px] text-gray-700 hover:text-red-500 transition-colors w-full"
+          className="items-start justify-start gap-3 px-2 py-2.5 text-gray-700 hover:text-red-500 transition-colors w-full"
         >
-          <LogoutOutlined className="text-[20px]" />
+          <LogoutOutlined className="text-p3" />
           <span className="text-p3 font-medium">Log Out</span>
         </Button>
       </div>
-    </aside>
+    </div>
+  );
+
+  return (
+    <>
+      {/* Desktop Sidebar - visible on lg+, sticky */}
+      <div className="hidden md:block sticky top-0 h-screen overflow-y-auto">
+        {sidebarContent}
+      </div>
+
+      {/* Mobile Sidebar - overlay */}
+      {isOpen && (
+        <div className="md:hidden fixed inset-0 z-50">
+          {/* Backdrop */}
+          <div
+            className="fixed inset-0 bg-black/50 transition-opacity"
+            onClick={onClose}
+          />
+          {/* Sidebar */}
+          <div className="fixed inset-y-0 left-0 z-50 transform transition-transform duration-300 ease-in-out">
+            {sidebarContent}
+          </div>
+        </div>
+      )}
+    </>
   );
 };