diff --git a/backend/.github/workflows/backend-ci.yml b/backend/.github/workflows/backend-ci.yml
index 31d28ca..4e831ec 100644
--- a/backend/.github/workflows/backend-ci.yml
+++ b/backend/.github/workflows/backend-ci.yml
@@ -25,10 +25,23 @@ jobs:
           source venv/bin/activate
           pip install -r requirements.txt
 
-      - name: Run pylint (backend only)
+      - name: Cache Python dependencies
+        uses: actions/cache@v2
+        with:
+          path: venv
+          key: ${{ runner.os }}-python-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-python-
+
+      - name: Run pylint (backend only on changed files)
         run: |
           source venv/bin/activate
-          pylint . --exit-zero | tee pylint.log
+          changed_files=$(git diff --name-only HEAD^..HEAD | grep '\.py$' || true)
+          if [ -n "$changed_files" ]; then
+            pylint $changed_files --exit-zero | tee pylint.log
+          else
+            echo "No Python files changed, skipping pylint."
+          fi
           SCORE=$(tail -n 2 pylint.log | grep -oP '[0-9]+\.[0-9]+(?=/10)')
           echo "Pylint score: $SCORE"
           python -c "import sys; sys.exit(0 if float('$SCORE') >= 8.0 else 1)"
@@ -58,6 +71,14 @@ jobs:
           pip install -r backend/requirements.txt
           pip install pytest-html
 
+      - name: Cache Python dependencies
+        uses: actions/cache@v2
+        with:
+          path: venv
+          key: ${{ runner.os }}-python-${{ hashFiles('backend/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-python-
+
       - name: Start Flask API server
         run: |
           nohup python backend/main.py > flask.log 2>&1 &
@@ -67,7 +88,7 @@ jobs:
               break
             fi
             echo "Waiting for Flask... Attempt $i/10"
-            sleep 3
+            sleep 5
           done
 
       - name: Run backend tests with pytest
@@ -89,7 +110,7 @@ jobs:
 
   build-frontend:
     runs-on: self-hosted
-    needs: lint
+    needs: [lint, test]
 
     steps:
       - name: Checkout repository
@@ -105,6 +126,14 @@ jobs:
         with:
           node-version: '20'
 
+      - name: Cache node modules
+        uses: actions/cache@v2
+        with:
+          path: frontend/node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('frontend/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
       - name: Install frontend dependencies
         working-directory: frontend
         run: npm install