diff --git a/.eslintrc.js b/.eslintrc.js
index 848ffd3e3..c946b7f16 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -16,6 +16,7 @@ module.exports = {
     },
     ignorePatterns: ['.eslintrc.js'],
     rules: {
+      'validate-translation-keys': 'warn',
       '@typescript-eslint/interface-name-prefix': 'off',
       '@typescript-eslint/explicit-function-return-type': 'off',
       '@typescript-eslint/explicit-module-boundary-types': 'off',
diff --git a/eslint-rules/validate-translation-keys.js b/eslint-rules/validate-translation-keys.js
new file mode 100644
index 000000000..782613d28
--- /dev/null
+++ b/eslint-rules/validate-translation-keys.js
@@ -0,0 +1,75 @@
+const fs = require('fs');
+const path = require('path');
+
+function loadKeys(filePath) {
+  try {
+    const data = fs.readFileSync(filePath, 'utf8');
+    const json = JSON.parse(data);
+    const keys = new Set();
+
+    function recurse(obj, prefix = '') {
+      for (const [k, v] of Object.entries(obj)) {
+        const full = prefix ? `${prefix}.${k}` : k;
+        if (v && typeof v === 'object') {
+          recurse(v, full);
+        } else {
+          keys.add(full);
+        }
+      }
+    }
+    recurse(json);
+    return keys;
+  } catch (error) {
+    console.warn(`Could not load translation file: ${filePath}`);
+    return new Set();
+  }
+}
+
+const langs = {
+  German: loadKeys(path.join(process.cwd(), 'src/translations/languages/de.json')),
+  French: loadKeys(path.join(process.cwd(), 'src/translations/languages/fr.json')),
+  Italian: loadKeys(path.join(process.cwd(), 'src/translations/languages/it.json')),
+};
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'Ensure translation keys exist in DE/FR/IT',
+      category: 'Possible Errors',
+    },
+    schema: [],
+    messages: {
+      missingTranslation: 'Translation key "{{key}}" missing in: {{languages}}',
+      invalidKey: 'Translation key "{{key}}" not found in any translation file',
+    },
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (
+          node.callee.name === 'translate' &&
+          node.arguments.length >= 2 &&
+          node.arguments[0].type === 'Literal' &&
+          node.arguments[1].type === 'Literal'
+        ) {
+          const section = node.arguments[0].value;
+          const key = node.arguments[1].value;
+          const fullKey = `${section}.${key}`;
+
+          const missing = Object.entries(langs)
+            .filter(([, set]) => !set.has(fullKey))
+            .map(([name]) => name);
+
+          const reportData = { key: fullKey, languages: missing.join(', ') };
+          if (missing.length === 3) {
+            context.report({ node: node.arguments[1], messageId: 'invalidKey', data: reportData });
+          } else if (missing.length > 0) {
+            context.report({ node: node.arguments[1], messageId: 'missingTranslation', data: reportData });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/package.json b/package.json
index d1c57f563..9b6270781 100644
--- a/package.json
+++ b/package.json
@@ -64,8 +64,8 @@
     "widget": "cp src/index.tsx src/index.bak.tsx && cp src/index-widget.tsx src/index.tsx && env-cmd -f .env.prd env-cmd -f .env.widget react-app-rewired build && mv src/index.bak.tsx src/index.tsx",
     "widget:dev": "cp src/index.tsx src/index.bak.tsx && cp src/index-widget.tsx src/index.tsx && env-cmd -f .env.dev env-cmd -f .env.widget react-app-rewired build && mv src/index.bak.tsx src/index.tsx",
     "widget:loc": "cp src/index.tsx src/index.bak.tsx && cp src/index-widget.tsx src/index.tsx && env-cmd -f .env.loc env-cmd -f .env.widget react-app-rewired build && mv src/index.bak.tsx src/index.tsx",
-    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --no-fix",
-    "lint:fix": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.{ts,tsx}\" --rulesdir eslint-rules --no-fix",
+    "lint:fix": "eslint \"{src,apps,libs,test}/**/*.{ts,tsx}\" --rulesdir eslint-rules --fix",
     "test": "react-app-rewired test --watchAll=false --passWithNoTests",
     "eject": "react-scripts eject",
     "serve": "serve build -l 4000",