diff --git a/.github/actions/mobile-setup/action.yml b/.github/actions/mobile-setup/action.yml
index 8af040ddf..c06757f13 100644
--- a/.github/actions/mobile-setup/action.yml
+++ b/.github/actions/mobile-setup/action.yml
@@ -62,7 +62,7 @@ runs:
         yarn set version 4.6.0
 
         echo "📦 Installing JavaScript dependencies with strict lock file..."
-        if ! yarn install --immutable; then
+        if ! yarn install --immutable --inline-builds; then
           echo ""
           echo "❌ ERROR: yarn.lock is out of date!"
           echo ""
diff --git a/.github/workflows/mobile-deploy.yml b/.github/workflows/mobile-deploy.yml
index dca120497..4e56f1db3 100644
--- a/.github/workflows/mobile-deploy.yml
+++ b/.github/workflows/mobile-deploy.yml
@@ -162,19 +162,15 @@ jobs:
           echo "Xcode path:"
           xcode-select -p
 
-      - name: Cache Yarn dependencies
+      - name: Cache Yarn artifacts
         id: yarn-cache
         uses: ./.github/actions/cache-yarn
         with:
           path: |
             .yarn/cache
-            node_modules
-            ${{ env.APP_PATH }}/node_modules
-          key: ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-${{ env.GH_YARN_CACHE_VERSION }}-${{ hashFiles('yarn.lock') }}-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-${{ env.GH_YARN_CACHE_VERSION }}-${{ hashFiles('yarn.lock') }}-
-            ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-${{ env.GH_YARN_CACHE_VERSION }}-
-            ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-
+            .yarn/install-state.gz
+            .yarn/unplugged
+          cache-version: ${{ env.GH_CACHE_VERSION }}-node-${{ env.NODE_VERSION_SANITIZED }}-${{ hashFiles('.yarnrc.yml') }}
 
       - name: Cache Ruby gems
         id: gems-cache
@@ -195,7 +191,7 @@ jobs:
             ${{ env.APP_PATH }}/ios/Pods
             ~/Library/Caches/CocoaPods
           lock-file: app/ios/Podfile.lock
-          cache-version: ${{ env.GH_CACHE_VERSION }}-${{ env.GH_PODS_CACHE_VERSION }}-${{ github.sha }}
+          cache-version: ${{ env.GH_CACHE_VERSION }}-${{ env.GH_PODS_CACHE_VERSION }}
 
       - name: Log cache status
         run: |
@@ -204,6 +200,9 @@ jobs:
           echo "- Gems cache hit: ${{ steps.gems-cache.outputs.cache-hit }}"
           echo "- Pods cache hit: ${{ steps.pods-cache.outputs.cache-hit }}"
 
+      - name: Disable Yarn hardened mode
+        run: echo "YARN_ENABLE_HARDENED_MODE=0" >> $GITHUB_ENV
+
       - name: Verify lock files are up to date
         run: |
           echo "🔍 Checking if lock files are in sync with dependency files..."
@@ -702,19 +701,15 @@ jobs:
             echo "✅ Building from latest staging commit"
           fi
 
-      - name: Cache Yarn dependencies
+      - name: Cache Yarn artifacts
         id: yarn-cache
         uses: ./.github/actions/cache-yarn
         with:
           path: |
             .yarn/cache
-            node_modules
-            ${{ env.APP_PATH }}/node_modules
-          key: ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-${{ env.GH_YARN_CACHE_VERSION }}-${{ hashFiles('yarn.lock') }}-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-${{ env.GH_YARN_CACHE_VERSION }}-${{ hashFiles('yarn.lock') }}-
-            ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-${{ env.GH_YARN_CACHE_VERSION }}-
-            ${{ runner.os }}-node-${{ env.NODE_VERSION_SANITIZED }}-yarn-${{ env.GH_CACHE_VERSION }}-
+            .yarn/install-state.gz
+            .yarn/unplugged
+          cache-version: ${{ env.GH_CACHE_VERSION }}-node-${{ env.NODE_VERSION_SANITIZED }}-${{ hashFiles('.yarnrc.yml') }}
 
       - name: Cache Ruby gems
         id: gems-cache
@@ -731,14 +726,14 @@ jobs:
         id: gradle-cache
         uses: ./.github/actions/cache-gradle
         with:
-          cache-version: ${{ env.GH_CACHE_VERSION }}-${{ env.GH_GRADLE_CACHE_VERSION }}-${{ github.sha }}
+          cache-version: ${{ env.GH_CACHE_VERSION }}-${{ env.GH_GRADLE_CACHE_VERSION }}
 
       - name: Cache Android NDK
         id: ndk-cache
         uses: actions/cache@v4
         with:
           path: ${{ env.ANDROID_SDK_ROOT }}/ndk/${{ env.ANDROID_NDK_VERSION }}
-          key: ${{ runner.os }}-ndk-${{ env.ANDROID_NDK_VERSION }}-${{ github.sha }}
+          key: ${{ runner.os }}-ndk-${{ env.ANDROID_NDK_VERSION }}
 
       - name: Log cache status
         run: |
@@ -748,6 +743,9 @@ jobs:
           echo "- Gradle cache hit: ${{ steps.gradle-cache.outputs.cache-hit }}"
           echo "- NDK cache hit: ${{ steps.ndk-cache.outputs.cache-hit }}"
 
+      - name: Disable Yarn hardened mode
+        run: echo "YARN_ENABLE_HARDENED_MODE=0" >> $GITHUB_ENV
+
       - name: Verify lock files are up to date
         run: |
           echo "🔍 Checking if lock files are in sync with dependency files..."
diff --git a/.github/workflows/mobile-e2e.yml b/.github/workflows/mobile-e2e.yml
index 364e5a90d..5dbadcab5 100644
--- a/.github/workflows/mobile-e2e.yml
+++ b/.github/workflows/mobile-e2e.yml
@@ -57,7 +57,14 @@ jobs:
       - name: Cache Yarn dependencies
         uses: ./.github/actions/cache-yarn
         with:
-          cache-version: ${{ env.GH_CACHE_VERSION }}-node-${{ env.NODE_VERSION_SANITIZED }}
+          path: |
+            .yarn/cache
+            .yarn/install-state.gz
+            .yarn/unplugged
+          cache-version: ${{ env.GH_CACHE_VERSION }}-node-${{ env.NODE_VERSION_SANITIZED }}-${{ hashFiles('.yarnrc.yml') }}
+      - name: Toggle Yarn hardened mode for trusted PRs
+        if: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork == false }}
+        run: echo "YARN_ENABLE_HARDENED_MODE=0" >> $GITHUB_ENV
       - run: yarn install --immutable --silent
       - name: Validate Maestro test file
         run: |
@@ -162,7 +169,14 @@ jobs:
       - name: Cache Yarn dependencies
         uses: ./.github/actions/cache-yarn
         with:
-          cache-version: ${{ env.GH_CACHE_VERSION }}-node-${{ env.NODE_VERSION_SANITIZED }}
+          path: |
+            .yarn/cache
+            .yarn/install-state.gz
+            .yarn/unplugged
+          cache-version: ${{ env.GH_CACHE_VERSION }}-node-${{ env.NODE_VERSION_SANITIZED }}-${{ hashFiles('.yarnrc.yml') }}
+      - name: Toggle Yarn hardened mode for trusted PRs
+        if: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork == false }}
+        run: echo "YARN_ENABLE_HARDENED_MODE=0" >> $GITHUB_ENV
       - run: yarn install --immutable --silent
       - name: Validate Maestro test file
         run: |
@@ -195,6 +209,12 @@ jobs:
           xcodebuild -version
           echo "Xcode path:"
           xcode-select -p
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ github.job }}-${{ runner.os }}
+      - name: Add ccache to PATH
+        run: echo "/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -212,10 +232,10 @@ jobs:
         uses: actions/cache@v4
         with:
           path: app/ios/build
-          key: ${{ runner.os }}-derived-data-${{ env.XCODE_VERSION }}-${{ hashFiles('app/ios/Podfile.lock', 'app/ios/OpenPassport.xcworkspace/contents.xcworkspacedata', 'app/ios/Self.xcworkspace/contents.xcworkspacedata') }}
+          key: ${{ runner.os }}-derived-data-${{ env.GH_CACHE_VERSION }}-${{ env.XCODE_VERSION }}-${{ hashFiles('app/ios/Podfile.lock', 'yarn.lock') }}
           restore-keys: |
-            ${{ runner.os }}-derived-data-${{ env.XCODE_VERSION }}-${{ hashFiles('app/ios/Podfile.lock') }}-
-            ${{ runner.os }}-derived-data-${{ env.XCODE_VERSION }}-
+            ${{ runner.os }}-derived-data-${{ env.GH_CACHE_VERSION }}-${{ env.XCODE_VERSION }}-
+            ${{ runner.os }}-derived-data-${{ env.GH_CACHE_VERSION }}-
       - name: Verify iOS Runtime
         run: |
           echo "📱 Verifying iOS Runtime availability..."