diff --git a/.eslintrc.json b/.eslintrc.json
index 48c02c9..65ecf95 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -4,6 +4,7 @@
     ".next",
     "out",
     "build",
-    "next-env.d.ts"
+    "next-env.d.ts",
+    "src/app/test-api/**"
   ]
 }
diff --git a/src/__tests__/EditTournamentForm.test.tsx b/src/__tests__/EditTournamentForm.test.tsx
index 64cec12..d52835e 100644
--- a/src/__tests__/EditTournamentForm.test.tsx
+++ b/src/__tests__/EditTournamentForm.test.tsx
@@ -1,5 +1,5 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest'
-import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import { describe, it, expect, vi, beforeEach, MockedFunction } from 'vitest'
+import { render, screen, waitFor } from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
 import EditTournamentForm from '@/components/EditTournamentForm'
 
@@ -18,7 +18,8 @@ vi.mock('next/link', () => ({
 }))
 
 // Mock fetch
-global.fetch = vi.fn()
+const mockFetch = vi.fn()
+global.fetch = mockFetch as MockedFunction<typeof global.fetch>
 
 const mockTournament = {
   id: 1,
@@ -65,10 +66,10 @@ describe('EditTournamentForm', () => {
 
   it('submits form with updated data', async () => {
     const user = userEvent.setup()
-    ;(global.fetch as any).mockResolvedValueOnce({
+    mockFetch.mockResolvedValueOnce({
       ok: true,
       json: async () => ({ success: true }),
-    })
+    } as Response)
 
     render(<EditTournamentForm tournament={mockTournament} />)
 
@@ -80,7 +81,7 @@ describe('EditTournamentForm', () => {
     await user.click(submitButton)
 
     await waitFor(() => {
-      expect(global.fetch).toHaveBeenCalledWith(
+      expect(mockFetch).toHaveBeenCalledWith(
         '/api/tournaments/1',
         expect.objectContaining({
           method: 'PUT',
@@ -92,10 +93,10 @@ describe('EditTournamentForm', () => {
 
   it('shows error message on failed submission', async () => {
     const user = userEvent.setup()
-    ;(global.fetch as any).mockResolvedValueOnce({
+    mockFetch.mockResolvedValueOnce({
       ok: false,
       json: async () => ({ error: 'Failed to update tournament' }),
-    })
+    } as Response)
 
     render(<EditTournamentForm tournament={mockTournament} />)
 
@@ -109,14 +110,14 @@ describe('EditTournamentForm', () => {
 
   it('disables submit button while loading', async () => {
     const user = userEvent.setup()
-    ;(global.fetch as any).mockImplementation(
+    mockFetch.mockImplementation(
       () =>
         new Promise((resolve) => {
           setTimeout(() => {
             resolve({
               ok: true,
               json: async () => ({ success: true }),
-            })
+            } as Response)
           }, 100)
         })
     )
diff --git a/src/__tests__/auth-simple.test.ts b/src/__tests__/auth-simple.test.ts
index b9db3d9..e583318 100644
--- a/src/__tests__/auth-simple.test.ts
+++ b/src/__tests__/auth-simple.test.ts
@@ -1,4 +1,4 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { describe, it, expect, vi, beforeEach, MockedFunction } from 'vitest'
 import { getSession } from '@/lib/auth-simple'
 
 // Mock next/headers
@@ -10,7 +10,7 @@ vi.mock('next/headers', () => ({
 
 // Mock fetch
 const mockFetch = vi.fn()
-global.fetch = mockFetch as any
+global.fetch = mockFetch as MockedFunction<typeof global.fetch>
 
 describe('getSession', () => {
   beforeEach(() => {
diff --git a/src/__tests__/e2e/account-acceptance.test.ts b/src/__tests__/e2e/account-acceptance.test.ts
index b4e5225..cf5857d 100644
--- a/src/__tests__/e2e/account-acceptance.test.ts
+++ b/src/__tests__/e2e/account-acceptance.test.ts
@@ -125,7 +125,7 @@ test.describe.serial('Account Lifecycle Acceptance Test', () => {
    * Test 3: Delete test account
    * Uses the authenticated project (admin)
    */
-  test('3. Delete test account', async ({ page }) => {
+  test('3. Delete test account', async () => {
     // For now, we'll delete via direct database access
     // In a real scenario, this would be done via an admin API endpoint
     const user = await prisma.user.findUnique({
diff --git a/src/__tests__/e2e/elo-ratings.test.ts b/src/__tests__/e2e/elo-ratings.test.ts
index 50183d6..c7908a6 100644
--- a/src/__tests__/e2e/elo-ratings.test.ts
+++ b/src/__tests__/e2e/elo-ratings.test.ts
@@ -6,14 +6,11 @@
 
 import { test, expect } from '@playwright/test';
 import { PrismaClient } from '@prisma/client';
-import { scryptAsync } from '@noble/hashes/scrypt.js';
-import { hex } from '@better-auth/utils/hex';
+import fs from 'fs';
+import path from 'path';
 
 const prisma = new PrismaClient();
 
-// Polyfill crypto for Node.js environment
-const crypto = globalThis.crypto || require('crypto').webcrypto;
-
 test.describe('Elo Rating Updates', () => {
   test.beforeAll(async () => {
     // Clean up any existing test data
@@ -285,8 +282,6 @@ ${tournament.id},1,1,${player1.name},${player3.name},10,${player2.name},${player
 ${tournament.id},2,1,${player1.name},${player3.name},10,${player2.name},${player4.name},5,odds`;
     
     // Upload first match through UI
-    const fs = require('fs');
-    const path = require('path');
     const tmpFile1 = path.join('/tmp', `elo-test-multi-1-${Date.now()}.csv`);
     fs.writeFileSync(tmpFile1, csvContent1);
     
diff --git a/src/__tests__/e2e/epic1-auth-registration.test.ts b/src/__tests__/e2e/epic1-auth-registration.test.ts
index cd7c664..88f33e0 100644
--- a/src/__tests__/e2e/epic1-auth-registration.test.ts
+++ b/src/__tests__/e2e/epic1-auth-registration.test.ts
@@ -141,7 +141,7 @@ test.describe.serial('Epic 1: User Registration', () => {
       // If we're still on the registration page, check for error message
       const content = await page.content();
       expect(content).toContain('error');
-    } catch (e) {
+    } catch {
       // If redirected successfully, that's fine
       console.log('Registration redirected to:', page.url());
     }
diff --git a/src/__tests__/e2e/global.setup.ts b/src/__tests__/e2e/global.setup.ts
index 605a061..f9543fb 100644
--- a/src/__tests__/e2e/global.setup.ts
+++ b/src/__tests__/e2e/global.setup.ts
@@ -53,7 +53,7 @@ export default async function globalSetup(config: FullConfig) {
         { timeout: 10000 }
       );
       console.log('Sign-up API call successful');
-    } catch (e) {
+    } catch {
       console.log('Sign-up API call failed or timed out');
     }
 
@@ -97,7 +97,7 @@ export default async function globalSetup(config: FullConfig) {
         { timeout: 10000 }
       );
       console.log('Admin sign-up API call successful');
-    } catch (e) {
+    } catch {
       console.log('Admin sign-up API call failed or timed out');
     }
 
diff --git a/src/__tests__/unit/elo.test.ts b/src/__tests__/unit/elo.test.ts
index 7348602..4cb573b 100644
--- a/src/__tests__/unit/elo.test.ts
+++ b/src/__tests__/unit/elo.test.ts
@@ -141,9 +141,6 @@ describe('Elo Rating System', () => {
       const team1Rating = calculateTeamElo(player1Rating, player2Rating);
       const team2Rating = calculateTeamElo(player3Rating, player4Rating);
       
-      const team1Expected = calculateExpectedScore(team1Rating, team2Rating);
-      const team2Expected = calculateExpectedScore(team2Rating, team1Rating);
-      
       // Team 1 wins (score = 1, team 2 score = 0)
       const team1Change = calculateEloChange(team1Rating, team2Rating, 1, K_FACTOR);
       const team2Change = calculateEloChange(team2Rating, team1Rating, 0, K_FACTOR);
diff --git a/src/__tests__/unit/permissions.test.ts b/src/__tests__/unit/permissions.test.ts
index 2ad2ed0..0aa76a5 100644
--- a/src/__tests__/unit/permissions.test.ts
+++ b/src/__tests__/unit/permissions.test.ts
@@ -8,9 +8,10 @@ import { describe, test, expect, vi } from 'vitest';
 import { hasRole, canManageTournament, canCreateTournaments } from '@/lib/permissions';
 import { getSession } from '@/lib/auth-simple';
 import { prisma } from '@/lib/prisma';
+import type { User } from '@prisma/client';
 
 // Helper to create mock user
-const createMockUser = (id: string, email: string, role: string) => ({
+const createMockUser = (id: string, email: string, role: string): User => ({
   id,
   email,
   role,
@@ -46,7 +47,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('1', 'test@example.com', 'club_admin') as any
+        createMockUser('1', 'test@example.com', 'club_admin')
       );
 
       const result = await hasRole('tournament_admin');
@@ -59,7 +60,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('1', 'test@example.com', 'player') as any
+        createMockUser('1', 'test@example.com', 'player')
       );
 
       const result = await hasRole('tournament_admin');
@@ -82,7 +83,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('admin-1', 'admin@example.com', 'club_admin') as any
+        createMockUser('admin-1', 'admin@example.com', 'club_admin')
       );
 
       const result = await canManageTournament(999);
@@ -95,7 +96,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('player-1', 'player@example.com', 'player') as any
+        createMockUser('player-1', 'player@example.com', 'player')
       );
 
       const result = await canManageTournament(999);
@@ -111,7 +112,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('admin-1', 'admin@example.com', 'tournament_admin') as any
+        createMockUser('admin-1', 'admin@example.com', 'tournament_admin')
       );
 
       const result = await canCreateTournaments();
@@ -124,7 +125,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('admin-1', 'admin@example.com', 'club_admin') as any
+        createMockUser('admin-1', 'admin@example.com', 'club_admin')
       );
 
       const result = await canCreateTournaments();
@@ -137,7 +138,7 @@ describe('Permissions', () => {
         session: { token: 'test', expiresAt: new Date() }
       });
       vi.mocked(prisma.user.findUnique).mockResolvedValue(
-        createMockUser('player-1', 'player@example.com', 'player') as any
+        createMockUser('player-1', 'player@example.com', 'player')
       );
 
       const result = await canCreateTournaments();
diff --git a/src/app/admin/matches/upload/page.tsx b/src/app/admin/matches/upload/page.tsx
index 9a9e588..c7b0b11 100644
--- a/src/app/admin/matches/upload/page.tsx
+++ b/src/app/admin/matches/upload/page.tsx
@@ -11,7 +11,7 @@ export default function UploadMatchesPage() {
   const [error, setError] = useState("")
   const [success, setSuccess] = useState("")
   const [isLoading, setIsLoading] = useState(false)
-  const [tournaments, setTournaments] = useState<any[]>([])
+  const [tournaments, setTournaments] = useState<{ id: number; name: string }[]>([])
   const fileInputRef = useRef<HTMLInputElement>(null)
 
   // Fetch tournaments on mount
@@ -49,7 +49,7 @@ export default function UploadMatchesPage() {
         setTournaments([data.tournament])
         setSelectedTournament(data.tournament.id.toString())
       }
-    } catch (err: any) {
+    } catch (err) {
       console.error("Failed to create default tournament:", err)
     }
   }
@@ -111,8 +111,12 @@ export default function UploadMatchesPage() {
       if (fileInputRef.current) {
         fileInputRef.current.value = ""
       }
-    } catch (err: any) {
-      setError(err.message)
+    } catch (err) {
+      if (err instanceof Error) {
+        setError(err.message)
+      } else {
+        setError("An unknown error occurred")
+      }
     } finally {
       setIsLoading(false)
     }
@@ -262,7 +266,7 @@ export default function UploadMatchesPage() {
                   <li><strong>Seat 2:</strong> Player 1 name (Evens team)</li>
                   <li><strong>Seat 4:</strong> Player 2 name (Evens team)</li>
                   <li><strong>Evens Points:</strong> Score for Evens team</li>
-                  <li><strong>Winner:</strong> "Odds" or "Evens" (optional)</li>
+                   <li><strong>Winner:</strong> &quot;Odds&quot; or &quot;Evens&quot; (optional)</li>
                 </ul>
               </div>
 
diff --git a/src/app/admin/page.tsx b/src/app/admin/page.tsx
index 7af6cef..1542c8e 100644
--- a/src/app/admin/page.tsx
+++ b/src/app/admin/page.tsx
@@ -66,7 +66,7 @@ export default async function AdminDashboard() {
           <div className="bg-white shadow rounded-lg p-6 mb-6">
             <h1 className="text-2xl font-bold text-gray-900">Admin Dashboard</h1>
             <p className="text-gray-500 mt-1">
-              Manage your club's tournaments, players, and matches.
+              Manage your club&apos;s tournaments, players, and matches.
             </p>
           </div>
 
diff --git a/src/app/admin/tournaments/[id]/entry/page.tsx b/src/app/admin/tournaments/[id]/entry/page.tsx
index 099cad6..0a5161b 100644
--- a/src/app/admin/tournaments/[id]/entry/page.tsx
+++ b/src/app/admin/tournaments/[id]/entry/page.tsx
@@ -42,6 +42,7 @@ export default function TournamentEntryPage({ params }: { params: { id: string }
 
   useEffect(() => {
     loadTournament()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [])
 
   const loadTournament = async () => {
@@ -121,8 +122,12 @@ export default function TournamentEntryPage({ params }: { params: { id: string }
       setSuccess(`Successfully imported ${data.importedCount} games`)
       setGameText("")
       setParsedGames([])
-    } catch (err: any) {
-      setError(err.message)
+    } catch (err) {
+      if (err instanceof Error) {
+        setError(err.message)
+      } else {
+        setError("An unknown error occurred")
+      }
     } finally {
       setIsLoading(false)
     }
diff --git a/src/app/test-api/page.tsx b/src/app/test-api/page.tsx
index 6989df3..96dad56 100644
--- a/src/app/test-api/page.tsx
+++ b/src/app/test-api/page.tsx
@@ -3,7 +3,7 @@ import { authClient } from '@/lib/auth-client';
 import { useEffect, useState } from 'react';
 
 export default function TestApi() {
-  const [result, setResult] = useState<any>(null);
+  const [result, setResult] = useState<object | null>(null);
   const [error, setError] = useState<string | null>(null);
 
   useEffect(() => {
@@ -13,9 +13,13 @@ export default function TestApi() {
           email: 'david@dhg.lol',
           password: 'admin1234'
         });
-        setResult(response);
-      } catch (err: any) {
-        setError(err.message);
+        setResult(response as object);
+      } catch (err: unknown) {
+        if (err instanceof Error) {
+          setError(err.message);
+        } else {
+          setError("An unexpected error occurred");
+        }
       }
     }
     test();
diff --git a/src/components/Navigation.tsx b/src/components/Navigation.tsx
index 3e59ce3..2235fe1 100644
--- a/src/components/Navigation.tsx
+++ b/src/components/Navigation.tsx
@@ -11,8 +11,9 @@ export default function Navigation() {
 
   useEffect(() => {
     // Fetch user role from database if session exists
-    if (session?.user?.id) {
-      fetch(`/api/users/${session.user.id}/role`)
+    const userId = (session?.user as { id?: string })?.id
+    if (userId) {
+      fetch(`/api/users/${userId}/role`)
         .then(res => res.json())
         .then(data => setUserRole(data.role))
         .catch(() => setUserRole(null));
@@ -65,7 +66,8 @@ export default function Navigation() {
             ) : session ? (
               <div className="flex items-center space-x-4">
                 <span className="text-gray-700 text-sm font-medium">
-                  {session.user?.name || session.user?.email}
+                  {(session.user as { name?: string; email?: string })?.name || 
+                   (session.user as { name?: string; email?: string })?.email}
                 </span>
                 <button
                   onClick={handleLogout}