diff --git a/frontend/__tests__/unit/components/AnimatedCounter.test.tsx b/frontend/__tests__/unit/components/AnimatedCounter.test.tsx
index 1f1a1e421f..b12061aa03 100644
--- a/frontend/__tests__/unit/components/AnimatedCounter.test.tsx
+++ b/frontend/__tests__/unit/components/AnimatedCounter.test.tsx
@@ -71,7 +71,7 @@ describe('AnimatedCounter', () => {
       })
 
       // Should show intermediate value
-      const displayedValue = parseInt(screen.getByText(/\d+/).textContent || '0')
+      const displayedValue = Number.parseInt(screen.getByText(/\d+/).textContent || '0')
       expect(displayedValue).toBeGreaterThan(0)
       expect(displayedValue).toBeLessThanOrEqual(50)
     })
diff --git a/frontend/__tests__/unit/components/SearchPageLayout.test.tsx b/frontend/__tests__/unit/components/SearchPageLayout.test.tsx
index 958a480535..fa9889a64f 100644
--- a/frontend/__tests__/unit/components/SearchPageLayout.test.tsx
+++ b/frontend/__tests__/unit/components/SearchPageLayout.test.tsx
@@ -251,7 +251,7 @@ describe('<SearchPageLayout />', () => {
       <SearchPageLayout
         isLoaded={true}
         totalPages={3}
-        currentPage={NaN}
+        currentPage={Number.NaN}
         onSearch={() => {}}
         onPageChange={handlePageChange}
         searchQuery=""
@@ -346,7 +346,7 @@ describe('<SearchPageLayout />', () => {
     render(
       <SearchPageLayout
         isLoaded={true}
-        totalPages={NaN}
+        totalPages={Number.NaN}
         currentPage={1}
         onSearch={() => {}}
         onPageChange={() => {}}
diff --git a/frontend/eslint-rules/no-global-isfinite.mjs b/frontend/eslint-rules/no-global-isfinite.mjs
new file mode 100644
index 0000000000..86c186a4bf
--- /dev/null
+++ b/frontend/eslint-rules/no-global-isfinite.mjs
@@ -0,0 +1,31 @@
+const noGlobalIsFiniteRule = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Disallow use of global isFinite, use Number.isFinite instead',
+      recommended: false,
+    },
+    fixable: 'code',
+    messages: {
+      useNumberIsFinite: 'Use Number.isFinite() instead of global isFinite().',
+    },
+    schema: [],
+  },
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type === 'Identifier' && node.callee.name === 'isFinite') {
+          context.report({
+            node: node.callee,
+            messageId: 'useNumberIsFinite',
+            fix(fixer) {
+              return fixer.replaceText(node.callee, 'Number.isFinite')
+            },
+          })
+        }
+      },
+    }
+  },
+}
+
+export default noGlobalIsFiniteRule
diff --git a/frontend/eslint-rules/no-global-isnan.mjs b/frontend/eslint-rules/no-global-isnan.mjs
new file mode 100644
index 0000000000..123f1ee758
--- /dev/null
+++ b/frontend/eslint-rules/no-global-isnan.mjs
@@ -0,0 +1,31 @@
+const noGlobalIsNaNRule = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Disallow use of global isNaN, use Number.isNaN instead',
+      recommended: false,
+    },
+    fixable: 'code',
+    messages: {
+      useNumberIsNaN: 'Use Number.isNaN() instead of global isNaN().',
+    },
+    schema: [],
+  },
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type === 'Identifier' && node.callee.name === 'isNaN') {
+          context.report({
+            node: node.callee,
+            messageId: 'useNumberIsNaN',
+            fix(fixer) {
+              return fixer.replaceText(node.callee, 'Number.isNaN')
+            },
+          })
+        }
+      },
+    }
+  },
+}
+
+export default noGlobalIsNaNRule
diff --git a/frontend/eslint-rules/no-global-nan.mjs b/frontend/eslint-rules/no-global-nan.mjs
new file mode 100644
index 0000000000..0a499b8faa
--- /dev/null
+++ b/frontend/eslint-rules/no-global-nan.mjs
@@ -0,0 +1,44 @@
+const noGlobalNaNRule = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Disallow use of global NaN, use Number.NaN instead',
+      recommended: false,
+    },
+    fixable: 'code',
+    messages: {
+      useNumberNaN: 'Use Number.NaN instead of global NaN.',
+    },
+    schema: [],
+  },
+  create(context) {
+    return {
+      Identifier(node) {
+        // Only report if it's 'NaN' and not already part of 'Number.NaN'
+        if (node.name === 'NaN') {
+          const parent = node.parent
+          if (
+            parent &&
+            parent.type === 'MemberExpression' &&
+            parent.property === node &&
+            parent.object &&
+            parent.object.type === 'Identifier' &&
+            parent.object.name === 'Number'
+          ) {
+            return
+          }
+
+          context.report({
+            node,
+            messageId: 'useNumberNaN',
+            fix(fixer) {
+              return fixer.replaceText(node, 'Number.NaN')
+            },
+          })
+        }
+      },
+    }
+  },
+}
+
+export default noGlobalNaNRule
diff --git a/frontend/eslint-rules/no-global-parsefloat.mjs b/frontend/eslint-rules/no-global-parsefloat.mjs
new file mode 100644
index 0000000000..8e5dbd234a
--- /dev/null
+++ b/frontend/eslint-rules/no-global-parsefloat.mjs
@@ -0,0 +1,31 @@
+const noGlobalParseFloatRule = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Disallow use of global parseFloat, use Number.parseFloat instead',
+      recommended: false,
+    },
+    fixable: 'code',
+    messages: {
+      useNumberParseFloat: 'Use Number.parseFloat() instead of global parseFloat().',
+    },
+    schema: [],
+  },
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type === 'Identifier' && node.callee.name === 'parseFloat') {
+          context.report({
+            node: node.callee,
+            messageId: 'useNumberParseFloat',
+            fix(fixer) {
+              return fixer.replaceText(node.callee, 'Number.parseFloat')
+            },
+          })
+        }
+      },
+    }
+  },
+}
+
+export default noGlobalParseFloatRule
diff --git a/frontend/eslint-rules/no-global-parseint.mjs b/frontend/eslint-rules/no-global-parseint.mjs
new file mode 100644
index 0000000000..75d26028c3
--- /dev/null
+++ b/frontend/eslint-rules/no-global-parseint.mjs
@@ -0,0 +1,31 @@
+const noGlobalParseIntRule = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Disallow use of global parseInt, use Number.parseInt instead',
+      recommended: false,
+    },
+    fixable: 'code',
+    messages: {
+      useNumberParseInt: 'Use Number.parseInt() instead of global parseInt().',
+    },
+    schema: [],
+  },
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type === 'Identifier' && node.callee.name === 'parseInt') {
+          context.report({
+            node: node.callee,
+            messageId: 'useNumberParseInt',
+            fix(fixer) {
+              return fixer.replaceText(node.callee, 'Number.parseInt')
+            },
+          })
+        }
+      },
+    }
+  },
+}
+
+export default noGlobalParseIntRule
diff --git a/frontend/eslint.config.mjs b/frontend/eslint.config.mjs
index a5045824dd..edf4c88d8b 100644
--- a/frontend/eslint.config.mjs
+++ b/frontend/eslint.config.mjs
@@ -15,6 +15,11 @@ import react from 'eslint-plugin-react'
 import reactHooks from 'eslint-plugin-react-hooks'
 import nextPlugin from '@next/eslint-plugin-next'
 import globals from 'globals'
+import noGlobalIsFiniteRule from './eslint-rules/no-global-isfinite.mjs'
+import noGlobalIsNaNRule from './eslint-rules/no-global-isnan.mjs'
+import noGlobalNaNRule from './eslint-rules/no-global-nan.mjs'
+import noGlobalParseFloatRule from './eslint-rules/no-global-parsefloat.mjs'
+import noGlobalParseIntRule from './eslint-rules/no-global-parseint.mjs'
 
 const __filename = fileURLToPath(import.meta.url)
 const __dirname = dirname(__filename)
@@ -61,6 +66,15 @@ const eslintConfig = [
       react,
       'jsx-a11y': jsxA11y,
       '@next/next': nextPlugin,
+      nest: {
+        rules: {
+          'no-global-isfinite': noGlobalIsFiniteRule,
+          'no-global-isnan': noGlobalIsNaNRule,
+          'no-global-nan': noGlobalNaNRule,
+          'no-global-parsefloat': noGlobalParseFloatRule,
+          'no-global-parseint': noGlobalParseIntRule,
+        },
+      },
     },
     settings: {
       'import/resolver': {
@@ -149,6 +163,11 @@ const eslintConfig = [
       'jsx-a11y/no-distracting-elements': 'warn',
       'jsx-a11y/label-has-associated-control': 'error',
       'jsx-a11y/click-events-have-key-events': 'warn',
+      'nest/no-global-isfinite': 'error',
+      'nest/no-global-isnan': 'error',
+      'nest/no-global-nan': 'error',
+      'nest/no-global-parsefloat': 'error',
+      'nest/no-global-parseint': 'error',
     },
   },
   {
diff --git a/frontend/src/app/my/mentorship/page.tsx b/frontend/src/app/my/mentorship/page.tsx
index 3de19c9c32..e8271be1ad 100644
--- a/frontend/src/app/my/mentorship/page.tsx
+++ b/frontend/src/app/my/mentorship/page.tsx
@@ -24,7 +24,7 @@ const MyMentorshipPage: React.FC = () => {
   const username = (session as ExtendedSession)?.user?.login
 
   const initialQuery = searchParams.get('q') || ''
-  const initialPage = parseInt(searchParams.get('page') || '1', 10)
+  const initialPage = Number.parseInt(searchParams.get('page') || '1', 10)
 
   const [searchQuery, setSearchQuery] = useState(initialQuery)
   const [debouncedQuery, setDebouncedQuery] = useState(initialQuery)
diff --git a/frontend/src/components/ModuleCard.tsx b/frontend/src/components/ModuleCard.tsx
index 479e9ec136..4f70839e6c 100644
--- a/frontend/src/components/ModuleCard.tsx
+++ b/frontend/src/components/ModuleCard.tsx
@@ -98,7 +98,7 @@ export default ModuleCard
 export const getSimpleDuration = (start: string, end: string): string => {
   const startDate = new Date(start)
   const endDate = new Date(end)
-  if (isNaN(startDate.getTime()) || isNaN(endDate.getTime())) {
+  if (Number.isNaN(startDate.getTime()) || Number.isNaN(endDate.getTime())) {
     return 'Invalid duration'
   }
 
diff --git a/frontend/src/hooks/useSearchPage.ts b/frontend/src/hooks/useSearchPage.ts
index dd92aa9545..7846ea3684 100644
--- a/frontend/src/hooks/useSearchPage.ts
+++ b/frontend/src/hooks/useSearchPage.ts
@@ -37,7 +37,9 @@ export function useSearchPage<T>({
   const searchParams = useSearchParams()
 
   const [items, setItems] = useState<T[]>([])
-  const [currentPage, setCurrentPage] = useState<number>(parseInt(searchParams.get('page') || '1'))
+  const [currentPage, setCurrentPage] = useState<number>(
+    Number.parseInt(searchParams.get('page') || '1')
+  )
   const [searchQuery, setSearchQuery] = useState<string>(searchParams.get('q') || '')
   const [sortBy, setSortBy] = useState<string>(searchParams.get('sortBy') || defaultSortBy)
   const [order, setOrder] = useState<string>(searchParams.get('order') || defaultOrder)
diff --git a/frontend/src/utils/dateFormatter.ts b/frontend/src/utils/dateFormatter.ts
index 26b6e0a170..3c6ab04f36 100644
--- a/frontend/src/utils/dateFormatter.ts
+++ b/frontend/src/utils/dateFormatter.ts
@@ -8,7 +8,7 @@ export const formatDate = (input: number | string) => {
       ? new Date(input * 1000) // Unix timestamp in seconds
       : new Date(input) // ISO date string
 
-  if (isNaN(date.getTime())) {
+  if (Number.isNaN(date.getTime())) {
     throw new Error('Invalid date')
   }
 
@@ -23,7 +23,7 @@ export const formatDateRange = (startDate: number | string, endDate: number | st
   const start = typeof startDate === 'number' ? new Date(startDate * 1000) : new Date(startDate)
   const end = typeof endDate === 'number' ? new Date(endDate * 1000) : new Date(endDate)
 
-  if (isNaN(start.getTime()) || isNaN(end.getTime())) {
+  if (Number.isNaN(start.getTime()) || Number.isNaN(end.getTime())) {
     throw new Error('Invalid date')
   }
 
@@ -63,7 +63,7 @@ export const formatDateRange = (startDate: number | string, endDate: number | st
 export const formatDateForInput = (dateStr: string) => {
   if (!dateStr) return ''
   const date = new Date(dateStr)
-  if (isNaN(date.getTime())) {
+  if (Number.isNaN(date.getTime())) {
     throw new Error('Invalid date')
   }
   return date.toISOString().slice(0, 10)
diff --git a/frontend/src/utils/round.ts b/frontend/src/utils/round.ts
index 7440658196..8b41f06654 100644
--- a/frontend/src/utils/round.ts
+++ b/frontend/src/utils/round.ts
@@ -1,5 +1,5 @@
 export const round = (value: number, precision = 2): number => {
-  if (isNaN(value)) return 0 // Handle NaN values
+  if (Number.isNaN(value)) return 0 // Handle NaN values
   if (precision < 0) {
     throw new Error('Precision must be a non-negative integer')
   }