diff --git a/frontend/eslint.config.mjs b/frontend/eslint.config.mjs
index 7922013cb..d823a6af9 100644
--- a/frontend/eslint.config.mjs
+++ b/frontend/eslint.config.mjs
@@ -15,17 +15,16 @@ export default defineConfig(
   },
   {
     rules: {
-      "no-empty": "off", // Temporarily disabled until codebase conformant
-      "no-empty-pattern": "off", // Temporarily disabled until codebase conformant
       "no-undef": "off", // Temporarily disabled until codebase conformant
-      "no-useless-escape": "off", // Temporarily disabled until codebase conformant
-      "no-case-declarations": "off", // Temporarily disabled until codebase conformant
-      "prefer-const": "off", // Temporarily disabled until codebase conformant
-      "@typescript-eslint/ban-ts-comment": "off", // Temporarily disabled until codebase conformant
-      "@typescript-eslint/no-empty-object-type": "off", // Temporarily disabled until codebase conformant
+      "@typescript-eslint/no-empty-object-type": [
+        "error",
+        {
+          // Allow empty extending interfaces because there's no real reason not to, and it makes it obvious where to put extra attributes in the future
+          allowInterfaces: 'with-single-extends',
+        },
+      ],
       "@typescript-eslint/no-explicit-any": "off", // Temporarily disabled until codebase conformant
       "@typescript-eslint/no-require-imports": "off", // Temporarily disabled until codebase conformant
-      "@typescript-eslint/no-unused-expressions": "off", // Temporarily disabled until codebase conformant
       "@typescript-eslint/no-unused-vars": "off", // Temporarily disabled until codebase conformant
     },
   }
diff --git a/frontend/scripts/generate-licenses.js b/frontend/scripts/generate-licenses.js
index aaac69800..7ab425e19 100644
--- a/frontend/scripts/generate-licenses.js
+++ b/frontend/scripts/generate-licenses.js
@@ -224,7 +224,7 @@ function getLicenseUrl(licenseType) {
     // Handle complex SPDX expressions like "(MIT AND Zlib)" or "(MIT OR CC0-1.0)"
     if (licenseType.includes('AND') || licenseType.includes('OR')) {
         // Extract the first license from compound expressions for URL
-        const match = licenseType.match(/\(?\s*([A-Za-z0-9\-\.]+)/);
+        const match = licenseType.match(/\(?\s*([A-Za-z0-9\-.]+)/);
         if (match && licenseUrls[match[1]]) {
             return licenseUrls[match[1]];
         }
diff --git a/frontend/src/components/shared/QuickAccessBar.tsx b/frontend/src/components/shared/QuickAccessBar.tsx
index e65843fa4..8447a891c 100644
--- a/frontend/src/components/shared/QuickAccessBar.tsx
+++ b/frontend/src/components/shared/QuickAccessBar.tsx
@@ -17,8 +17,7 @@ import {
   getActiveNavButton,
 } from './quickAccessBar/QuickAccessBar';
 
-const QuickAccessBar = forwardRef<HTMLDivElement>(({
-}, ref) => {
+const QuickAccessBar = forwardRef<HTMLDivElement>((_, ref) => {
   const { t } = useTranslation();
   const { isRainbowMode } = useRainbowThemeContext();
   const { openFilesModal, isFilesModalOpen } = useFilesModalContext();
diff --git a/frontend/src/components/shared/fitText/textFit.ts b/frontend/src/components/shared/fitText/textFit.ts
index 37da2dc78..7a695ed77 100644
--- a/frontend/src/components/shared/fitText/textFit.ts
+++ b/frontend/src/components/shared/fitText/textFit.ts
@@ -82,8 +82,8 @@ export function adjustFontSizeToFit(
 
   return () => {
     cancelAnimationFrame(raf);
-    try { ro.disconnect(); } catch {}
-    try { mo.disconnect(); } catch {}
+    try { ro.disconnect(); } catch { /* Ignore errors */ }
+    try { mo.disconnect(); } catch { /* Ignore errors */ }
   };
 }
 
diff --git a/frontend/src/components/tools/shared/SuggestedToolsSection.tsx b/frontend/src/components/tools/shared/SuggestedToolsSection.tsx
index fca3b5e56..c1299a749 100644
--- a/frontend/src/components/tools/shared/SuggestedToolsSection.tsx
+++ b/frontend/src/components/tools/shared/SuggestedToolsSection.tsx
@@ -3,8 +3,6 @@ import { Stack, Text, Divider, Card, Group } from '@mantine/core';
 import { useTranslation } from 'react-i18next';
 import { useSuggestedTools } from '../../../hooks/useSuggestedTools';
 
-export interface SuggestedToolsSectionProps {}
-
 export function SuggestedToolsSection(): React.ReactElement {
   const { t } = useTranslation();
   const suggestedTools = useSuggestedTools();
diff --git a/frontend/src/components/tools/toolPicker/ToolSearch.tsx b/frontend/src/components/tools/toolPicker/ToolSearch.tsx
index 53a01cb77..d4350044e 100644
--- a/frontend/src/components/tools/toolPicker/ToolSearch.tsx
+++ b/frontend/src/components/tools/toolPicker/ToolSearch.tsx
@@ -126,7 +126,7 @@ const ToolSearch = ({
                 key={id}
                 variant="subtle"
                 onClick={() => {
-                  onToolSelect && onToolSelect(id);
+                  onToolSelect?.(id);
                   setDropdownOpen(false);
                 }}
                 leftSection={<div style={{ color: "var(--tools-text-and-icon-color)" }}>{tool.icon}</div>}
diff --git a/frontend/src/hooks/tools/convert/useConvertParametersAutoDetection.test.ts b/frontend/src/hooks/tools/convert/useConvertParametersAutoDetection.test.ts
index 32543ec91..798fdc5b4 100644
--- a/frontend/src/hooks/tools/convert/useConvertParametersAutoDetection.test.ts
+++ b/frontend/src/hooks/tools/convert/useConvertParametersAutoDetection.test.ts
@@ -347,9 +347,9 @@ describe('useConvertParameters - Auto Detection & Smart Conversion', () => {
 
       const malformedFiles: Array<{name: string}> = [
         { name: 'valid.pdf' },
-        // @ts-ignore - Testing runtime resilience
+        // @ts-expect-error - Testing runtime resilience
         { name: null },
-        // @ts-ignore
+        // @ts-expect-error - Testing runtime resilience
         { name: undefined }
       ];
 
diff --git a/frontend/src/hooks/tools/shared/useToolOperation.ts b/frontend/src/hooks/tools/shared/useToolOperation.ts
index 1c4f6c368..7bfcc3d32 100644
--- a/frontend/src/hooks/tools/shared/useToolOperation.ts
+++ b/frontend/src/hooks/tools/shared/useToolOperation.ts
@@ -172,7 +172,7 @@ export const useToolOperation = <TParams>(
       const validRegularFiles = extractFiles(validFiles);
 
       switch (config.toolType) {
-        case ToolType.singleFile:
+        case ToolType.singleFile: {
           // Individual file processing - separate API call per file
           const apiCallsConfig: ApiCallsConfig<TParams> = {
             endpoint: config.endpoint,
@@ -188,8 +188,9 @@ export const useToolOperation = <TParams>(
             actions.setStatus
           );
           break;
+        }
 
-        case ToolType.multiFile:
+        case ToolType.multiFile: {
           // Multi-file processing - single API call with all files
           actions.setStatus('Processing files...');
           const formData = config.buildFormData(params, validRegularFiles);
@@ -202,7 +203,7 @@ export const useToolOperation = <TParams>(
             // Use custom responseHandler for multi-file (handles ZIP extraction)
             processedFiles = await config.responseHandler(response.data, validRegularFiles);
           } else if (response.data.type === 'application/pdf' ||
-                     (response.headers && response.headers['content-type'] === 'application/pdf')) {
+                    (response.headers && response.headers['content-type'] === 'application/pdf')) {
             // Single PDF response (e.g. split with merge option) - use original filename
             const originalFileName = validRegularFiles[0]?.name || 'document.pdf';
             const singleFile = new File([response.data], originalFileName, { type: 'application/pdf' });
@@ -217,6 +218,7 @@ export const useToolOperation = <TParams>(
             }
           }
           break;
+        }
 
         case ToolType.custom:
           actions.setStatus('Processing files...');
@@ -253,9 +255,9 @@ export const useToolOperation = <TParams>(
             console.warn(`No file stub found for file: ${file.name}`);
           }
         }
-        
+
         const outputFileIds = await consumeFiles(inputFileIds, processedFiles);
-        
+
         // Store operation data for undo (only store what we need to avoid memory bloat)
         lastOperationRef.current = {
           inputFiles: extractFiles(validFiles), // Convert to File objects for undo
@@ -319,16 +321,17 @@ export const useToolOperation = <TParams>(
       // Undo the consume operation
       await undoConsumeFiles(inputFiles, inputStirlingFileStubs, outputFileIds);
       
+
       // Clear results and operation tracking
       resetResults();
       lastOperationRef.current = null;
-      
+
       // Show success message
       actions.setStatus(t('undoSuccess', 'Operation undone successfully'));
-      
+
     } catch (error: any) {
       let errorMessage = extractErrorMessage(error);
-      
+
       // Provide more specific error messages based on error type
       if (error.message?.includes('Mismatch between input files')) {
         errorMessage = t('undoDataMismatch', 'Cannot undo: operation data is corrupted');
@@ -337,9 +340,9 @@ export const useToolOperation = <TParams>(
       } else if (error.name === 'QuotaExceededError') {
         errorMessage = t('undoQuotaError', 'Cannot undo: insufficient storage space');
       }
-      
+
       actions.setError(`${t('undoFailed', 'Failed to undo operation')}: ${errorMessage}`);
-      
+
       // Don't clear the operation data if undo failed - user might want to try again
     }
   }, [undoConsumeFiles, resetResults, actions, t]);
diff --git a/frontend/src/index.tsx b/frontend/src/index.tsx
index 55fe7f046..38a0c1923 100644
--- a/frontend/src/index.tsx
+++ b/frontend/src/index.tsx
@@ -35,8 +35,11 @@ function updatePosthogConsent(){
       return;
     }
     const optIn = (window.CookieConsent as any).acceptedCategory('analytics');
-    optIn?
-      posthog.opt_in_capturing() : posthog.opt_out_capturing();
+    if (optIn) {
+      posthog.opt_in_capturing();
+    } else {
+      posthog.opt_out_capturing();
+    }
 
     console.log("Updated analytics consent: ", optIn? "opted in" : "opted out");
   }
diff --git a/frontend/src/services/enhancedPDFProcessingService.ts b/frontend/src/services/enhancedPDFProcessingService.ts
index 2d4bf4644..2b6b18c8c 100644
--- a/frontend/src/services/enhancedPDFProcessingService.ts
+++ b/frontend/src/services/enhancedPDFProcessingService.ts
@@ -183,7 +183,7 @@ export class EnhancedPDFProcessingService {
   ): Promise<ProcessedFile> {
     const arrayBuffer = await file.arrayBuffer();
     const pdf = await pdfWorkerManager.createDocument(arrayBuffer);
-    
+
     try {
       const totalPages = pdf.numPages;
 
@@ -460,11 +460,12 @@ export class EnhancedPDFProcessingService {
       case 'failed':
         this.metrics.failedFiles++;
         break;
-      case 'cacheHit':
+      case 'cacheHit': {
         // Update cache hit rate
         const totalAttempts = this.metrics.totalFiles + 1;
         this.metrics.cacheHitRate = (this.metrics.cacheHitRate * this.metrics.totalFiles + 1) / totalAttempts;
         break;
+      }
     }
   }
 
@@ -520,10 +521,7 @@ export class EnhancedPDFProcessingService {
     this.notifyListeners();
 
     // Force memory cleanup hint
-    if (typeof window !== 'undefined' && window.gc) {
-      let gc = window.gc;
-      setTimeout(() => gc(), 100);
-    }
+    setTimeout(() => window.gc?.(), 100);
   }
 
   /**
diff --git a/frontend/src/services/fileAnalyzer.ts b/frontend/src/services/fileAnalyzer.ts
index 537692600..1705bb54e 100644
--- a/frontend/src/services/fileAnalyzer.ts
+++ b/frontend/src/services/fileAnalyzer.ts
@@ -148,15 +148,17 @@ export class FileAnalyzer {
       case 'immediate_full':
         return pageCount * baseTime;
 
-      case 'priority_pages':
+      case 'priority_pages': {
         // Estimate time for priority pages (first 10)
         const priorityPages = Math.min(pageCount, 10);
         return priorityPages * baseTime;
+      }
 
-      case 'progressive_chunked':
+      case 'progressive_chunked': {
         // Estimate time for first chunk (20 pages)
         const firstChunk = Math.min(pageCount, 20);
         return firstChunk * baseTime;
+      }
 
       default:
         return pageCount * baseTime;
diff --git a/frontend/src/services/indexedDBManager.ts b/frontend/src/services/indexedDBManager.ts
index 2048c021f..9251998a3 100644
--- a/frontend/src/services/indexedDBManager.ts
+++ b/frontend/src/services/indexedDBManager.ts
@@ -73,7 +73,7 @@ class IndexedDBManager {
       request.onsuccess = () => {
         const db = request.result;
         console.log(`Successfully opened ${config.name}`);
-        
+
         // Set up close handler to clean up our references
         db.onclose = () => {
           console.log(`Database ${config.name} closed`);
@@ -87,13 +87,11 @@ class IndexedDBManager {
       request.onupgradeneeded = (event) => {
         const db = request.result;
         const oldVersion = event.oldVersion;
-        
+
         console.log(`Upgrading ${config.name} from v${oldVersion} to v${config.version}`);
 
         // Create or update object stores
         config.stores.forEach(storeConfig => {
-          let store: IDBObjectStore;
-
           if (db.objectStoreNames.contains(storeConfig.name)) {
             // Store exists - for now, just continue (could add migration logic here)
             console.log(`Object store '${storeConfig.name}' already exists`);
@@ -109,7 +107,7 @@ class IndexedDBManager {
             options.autoIncrement = storeConfig.autoIncrement;
           }
 
-          store = db.createObjectStore(storeConfig.name, options);
+          const store = db.createObjectStore(storeConfig.name, options);
           console.log(`Created object store '${storeConfig.name}'`);
 
           // Create indexes
@@ -168,7 +166,7 @@ class IndexedDBManager {
 
     return new Promise((resolve, reject) => {
       const deleteRequest = indexedDB.deleteDatabase(name);
-      
+
       deleteRequest.onerror = () => reject(deleteRequest.error);
       deleteRequest.onsuccess = () => {
         console.log(`Deleted database: ${name}`);
@@ -224,4 +222,4 @@ export const DATABASE_CONFIGS = {
   } as DatabaseConfig
 } as const;
 
-export const indexedDBManager = IndexedDBManager.getInstance();
\ No newline at end of file
+export const indexedDBManager = IndexedDBManager.getInstance();
diff --git a/frontend/src/services/pdfWorkerManager.ts b/frontend/src/services/pdfWorkerManager.ts
index 0999c5c29..57fc841e0 100644
--- a/frontend/src/services/pdfWorkerManager.ts
+++ b/frontend/src/services/pdfWorkerManager.ts
@@ -1,6 +1,6 @@
 /**
  * PDF.js Worker Manager - Centralized worker lifecycle management
- * 
+ *
  * Prevents infinite worker creation by managing PDF.js workers globally
  * and ensuring proper cleanup when operations complete.
  */
@@ -86,7 +86,7 @@ class PDFWorkerManager {
       const pdf = await loadingTask.promise;
       this.activeDocuments.add(pdf);
       this.workerCount++;
-      
+
       return pdf;
     } catch (error) {
       // If document creation fails, make sure to clean up the loading task
@@ -94,6 +94,7 @@ class PDFWorkerManager {
         try {
           loadingTask.destroy();
         } catch (destroyError) {
+          // Ignore errors
         }
       }
       throw error;
@@ -125,7 +126,7 @@ class PDFWorkerManager {
     documentsToDestroy.forEach(pdf => {
       this.destroyDocument(pdf);
     });
-    
+
     this.activeDocuments.clear();
     this.workerCount = 0;
   }
@@ -166,9 +167,10 @@ class PDFWorkerManager {
       try {
         pdf.destroy();
       } catch (error) {
+        // Ignore errors
       }
     });
-    
+
     this.activeDocuments.clear();
     this.workerCount = 0;
   }
@@ -182,4 +184,4 @@ class PDFWorkerManager {
 }
 
 // Export singleton instance
-export const pdfWorkerManager = PDFWorkerManager.getInstance();
\ No newline at end of file
+export const pdfWorkerManager = PDFWorkerManager.getInstance();
diff --git a/frontend/src/types/parameters.ts b/frontend/src/types/parameters.ts
index 6f8856a8b..91355cb81 100644
--- a/frontend/src/types/parameters.ts
+++ b/frontend/src/types/parameters.ts
@@ -1,7 +1,6 @@
 // Base parameter interfaces for reusable patterns
 
-export interface BaseParameters {
-  // Base interface that all tool parameters should extend
-  // Provides a foundation for adding common properties across all tools
-  // Examples of future additions: userId, sessionId, commonFlags, etc.
-}
\ No newline at end of file
+// Base interface that all tool parameters should extend
+// Provides a foundation for adding common properties across all tools
+// Examples of future additions: userId, sessionId, commonFlags, etc.
+export type BaseParameters = object