diff --git a/.circleci/config.yml b/.circleci/config.yml
index bb176b74..9b039167 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -29,10 +29,15 @@ jobs:
     steps:
       - checkout
       - run:
-          name: Install dependencies
+          name: Install pnpm and root dependencies
           command: |
             sudo npm install -g pnpm
             pnpm install --frozen-lockfile
+      - run:
+          name: Install functions dependencies
+          command: |
+            cd functions
+            npm install
       - run:
           name: Run linting
           command: |
@@ -47,9 +52,38 @@ jobs:
           name: Quality GC check
           command: npx quality-gc run || echo "Quality GC issues found"
 
+  deploy-worker:
+    docker:
+      - image: cimg/node:20.18
+    steps:
+      - checkout
+      - run:
+          name: Install pnpm and dependencies
+          command: |
+            sudo npm install -g pnpm
+            pnpm install --frozen-lockfile
+      - run:
+          name: Type check YouTube API v3 worker
+          command: pnpm exec tsc --noEmit
+      - run:
+          name: Deploy YouTube API v3 Worker to Cloudflare
+          command: |
+            if [ -n "${CLOUDFLARE_API_TOKEN}" ]; then
+              pnpm exec wrangler deploy src/youtube-worker.ts --name ytstudio
+            else
+              echo "CLOUDFLARE_API_TOKEN not configured — set it in CircleCI project env vars to enable deployment"
+              echo "Worker source validated via TypeScript type check"
+            fi
+
 workflows:
   version: 2
   validate:
     jobs:
       - python-checks
       - node-checks
+      - deploy-worker:
+          requires:
+            - node-checks
+          filters:
+            branches:
+              only: main
diff --git a/fix_app.py b/fix_app.py
index 247998d2..4ae61451 100644
--- a/fix_app.py
+++ b/fix_app.py
@@ -1,7 +1,7 @@
-import sys
+from pathlib import Path
 
-filepath = 'js/app.js'
-with open(filepath, 'r') as f:
+filepath = Path("js/app.js")
+with filepath.open() as f:
     lines = f.readlines()
 
 # Part 1: DOM elements
@@ -20,16 +20,16 @@
             "        DOM.episodesNavBtn.addEventListener('click', () => {\n",
             "            DOM.episodesSection.scrollIntoView({ behavior: 'smooth' });\n",
             "            if (document.body.classList.contains('mobile-nav-active')) {\n",
-                "                document.body.classList.remove('mobile-nav-active');\n",
+            "                document.body.classList.remove('mobile-nav-active');\n",
             "                if (DOM.menuToggle) DOM.menuToggle.setAttribute('aria-expanded', 'false');\n",
             "            }\n",
             "        });\n",
             "    }\n",
-            "\n"
+            "\n",
         ]
         for idx, new_line in enumerate(scroll_listener):
             lines.insert(i + idx, new_line)
         break
 
-with open(filepath, 'w') as f:
+with filepath.open("w") as f:
     f.writelines(lines)
diff --git a/fix_index.py b/fix_index.py
index 353b69c1..3476e3f2 100644
--- a/fix_index.py
+++ b/fix_index.py
@@ -1,10 +1,12 @@
-with open('index.html', 'r') as f:
+from pathlib import Path
+
+with Path("index.html").open() as f:
     content = f.read()
 
 # Add title attribute to search button
-old_search = '<button class=\"nav-link\" id=\"searchToggleBtn\" aria-controls=\"searchSection\" aria-expanded=\"false\">'
-new_search = '<button class=\"nav-link\" id=\"searchToggleBtn\" aria-controls=\"searchSection\" aria-expanded=\"false\" title=\"Search (/)\">'
+old_search = '<button class="nav-link" id="searchToggleBtn" aria-controls="searchSection" aria-expanded="false">'
+new_search = '<button class="nav-link" id="searchToggleBtn" aria-controls="searchSection" aria-expanded="false" title="Search (/)">'
 content = content.replace(old_search, new_search)
 
-with open('index.html', 'w') as f:
+with Path("index.html").open("w") as f:
     f.write(content)
diff --git a/functions/package.json b/functions/package.json
index 458cedb5..23555333 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -16,7 +16,6 @@
   "main": "lib/index.js",
   "dependencies": {
     "firebase-admin": "^13.9.0",
-    "firebase-admin": "^10.3.0",
     "firebase-functions": "^7.0.0",
     "lint": "^1.2.2"
   },
@@ -27,7 +26,7 @@
     "eslint-config-google": "^0.14.0",
     "eslint-plugin-import": "^2.25.4",
     "firebase-functions-test": "^3.4.1",
-    "typescript": "^6.0.0"
+    "typescript": "^5.6.0"
   },
   "private": true
 }