diff --git a/app/components/navbar.responsive-breakpoints.test.tsx b/app/components/navbar.responsive-breakpoints.test.tsx
index b347e3531..d908eabdf 100644
--- a/app/components/navbar.responsive-breakpoints.test.tsx
+++ b/app/components/navbar.responsive-breakpoints.test.tsx
@@ -145,11 +145,11 @@ describe('Navbar Responsive Breakpoints & Menu Toggle', () => {
   it('4. Hides the desktop nav row on mobile and only reveals mobile hamburger controls, via complementary md: classes', () => {
     const { container } = render(<Navbar />);
 
-    const desktopNavRow = container.querySelector('.hidden.items-center.gap-2.md\\:flex');
+    const desktopNavRow = container.querySelector('.hidden.items-center.gap-2.lg\\:flex');
     expect(desktopNavRow).toBeInTheDocument();
 
     const mobileControls = container.querySelector(
-      '.md\\:hidden.inline-flex.items-center.justify-center.gap-1'
+      '.lg\\:hidden.inline-flex.items-center.justify-center.gap-1'
     );
     expect(mobileControls).toBeInTheDocument();
   });
diff --git a/app/contributors/ContributorsSearch.mock-integrations.test.tsx b/app/contributors/ContributorsSearch.mock-integrations.test.tsx
new file mode 100644
index 000000000..3f92f6273
--- /dev/null
+++ b/app/contributors/ContributorsSearch.mock-integrations.test.tsx
@@ -0,0 +1,198 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import ContributorsSearch from './ContributorsSearch';
+
+// Mock framer-motion to avoid animation issues in tests
+vi.mock('framer-motion', async () => {
+  const React = await import('react');
+  const motionProps = new Set([
+    'whileHover',
+    'whileTap',
+    'whileInView',
+    'initial',
+    'animate',
+    'exit',
+    'variants',
+    'transition',
+    'viewport',
+    'drag',
+    'layout',
+    'layoutId',
+  ]);
+
+  const stripMotionProps = (props: Record<string, unknown>) =>
+    Object.fromEntries(Object.entries(props).filter(([key]) => !motionProps.has(key)));
+
+  const createMotionComponent = (tag: string) => {
+    const Component = ({
+      children,
+      ...props
+    }: React.HTMLAttributes<HTMLElement> & { children?: React.ReactNode }) =>
+      React.createElement(tag, stripMotionProps(props), children);
+    return Component;
+  };
+
+  return {
+    motion: {
+      div: createMotionComponent('div'),
+      span: createMotionComponent('span'),
+      p: createMotionComponent('p'),
+      a: createMotionComponent('a'),
+      button: createMotionComponent('button'),
+    },
+    AnimatePresence: ({ children }: { children?: React.ReactNode }) => <>{children}</>,
+  };
+});
+
+// Stubs for cache and service layer
+interface Contributor {
+  id: number;
+  login: string;
+  avatar_url: string;
+  contributions: number;
+  html_url: string;
+}
+
+const mockCache = {
+  get: vi.fn(),
+  set: vi.fn(),
+  clear: vi.fn(),
+};
+
+const mockFetchContributors = vi.fn();
+
+describe('ContributorsSearch - Mock Integrations & Local Cache Stubs', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockCache.get.mockReset();
+    mockCache.set.mockReset();
+    mockCache.clear.mockReset();
+    mockFetchContributors.mockReset();
+  });
+
+  // --- Test Case 1 ---
+  it('mocks standard asynchronous imports and databases using stubs', async () => {
+    const mockData: Contributor[] = [
+      {
+        id: 1,
+        login: 'contributor-one',
+        avatar_url: 'https://example.com/one.png',
+        contributions: 5,
+        html_url: 'https://github.com/one',
+      },
+    ];
+    mockFetchContributors.mockResolvedValue(mockData);
+
+    const result = await mockFetchContributors();
+    expect(result).toHaveLength(1);
+    expect(result[0].login).toBe('contributor-one');
+
+    render(<ContributorsSearch contributors={result} />);
+    expect(screen.getByRole('textbox')).toBeInTheDocument();
+    expect(screen.getByText('contributor-one')).toBeInTheDocument();
+  });
+
+  // --- Test Case 2 ---
+  it('tests service loading paths to ensure pending state overlays render', async () => {
+    let resolvePromise: (value: Contributor[]) => void = () => {};
+    const promise = new Promise<Contributor[]>((resolve) => {
+      resolvePromise = resolve;
+    });
+
+    mockFetchContributors.mockReturnValue(promise);
+
+    // Simulated component container that handles loading state
+    const LoadingContainer = ({ isPending }: { isPending: boolean }) => {
+      if (isPending) {
+        return <div role="status">Loading the collective...</div>;
+      }
+      return <ContributorsSearch contributors={[]} />;
+    };
+
+    const { rerender } = render(<LoadingContainer isPending={true} />);
+    expect(screen.getByRole('status')).toHaveTextContent('Loading the collective...');
+
+    resolvePromise([]);
+    await promise;
+
+    rerender(<LoadingContainer isPending={false} />);
+    expect(screen.queryByRole('status')).not.toBeInTheDocument();
+    expect(screen.getByRole('textbox')).toBeInTheDocument();
+  });
+
+  // --- Test Case 3 ---
+  it('asserts local cache layers are queried before triggering database retrievals', async () => {
+    const cachedData: Contributor[] = [
+      {
+        id: 2,
+        login: 'cached-contributor',
+        avatar_url: 'https://example.com/cached.png',
+        contributions: 10,
+        html_url: 'https://github.com/cached',
+      },
+    ];
+    mockCache.get.mockReturnValue(cachedData);
+
+    const getContributorsData = async () => {
+      const cacheVal = mockCache.get('contributors_search_cache');
+      if (cacheVal) return cacheVal;
+      return mockFetchContributors();
+    };
+
+    const result = await getContributorsData();
+
+    expect(mockCache.get).toHaveBeenCalledWith('contributors_search_cache');
+    expect(mockFetchContributors).not.toHaveBeenCalled();
+    expect(result).toEqual(cachedData);
+
+    render(<ContributorsSearch contributors={result} />);
+    expect(screen.getByText('cached-contributor')).toBeInTheDocument();
+  });
+
+  // --- Test Case 4 ---
+  it('verifies correct fallback procedures during fake endpoint timeout blocks', async () => {
+    mockFetchContributors.mockRejectedValue(new Error('Gateway Timeout'));
+
+    const getContributorsWithFallback = async () => {
+      try {
+        return await mockFetchContributors();
+      } catch {
+        return [];
+      }
+    };
+
+    const data = await getContributorsWithFallback();
+    expect(data).toEqual([]);
+
+    render(<ContributorsSearch contributors={data} />);
+    // "No architects found" should render because data is empty and we filter it
+    expect(screen.getByText('No architects found')).toBeInTheDocument();
+  });
+
+  // --- Test Case 5 ---
+  it('asserts complete cache sync is written on success callbacks', async () => {
+    const freshData: Contributor[] = [
+      {
+        id: 3,
+        login: 'fresh-contributor',
+        avatar_url: 'https://example.com/fresh.png',
+        contributions: 15,
+        html_url: 'https://github.com/fresh',
+      },
+    ];
+    mockFetchContributors.mockResolvedValue(freshData);
+
+    const syncAndFetch = async () => {
+      const data = await mockFetchContributors();
+      mockCache.set('contributors_search_cache', data);
+      return data;
+    };
+
+    const result = await syncAndFetch();
+    expect(mockCache.set).toHaveBeenCalledWith('contributors_search_cache', freshData);
+
+    render(<ContributorsSearch contributors={result} />);
+    expect(screen.getByText('fresh-contributor')).toBeInTheDocument();
+  });
+});