diff --git a/.github/worksflows/pr-internal.yml b/.github/worksflows/pr-internal.yml
new file mode 100644
index 0000000..8ebb6f3
--- /dev/null
+++ b/.github/worksflows/pr-internal.yml
@@ -0,0 +1,89 @@
+name: Python SDK Conditional Workflow
+
+on:
+  pull_request:
+    branches:
+      - main
+      - dev
+  push:
+    branches:
+      - dev
+
+jobs:
+  check_branch_protection:
+    if: github.event_name == 'pull_request' && github.base_ref == 'main'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check source branch
+        run: |
+          if [[ "${{ github.head_ref }}" != "dev" ]]; then
+            echo "❌ Pull requests to main branch must come from dev branch"
+            echo "Current source branch: ${{ github.head_ref }}"
+            exit 1
+          fi
+          echo "✅ Source branch check passed"
+
+  Timestamp:
+    if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
+    needs: [check_branch_protection]
+    uses: storyprotocol/gha-workflows/.github/workflows/reusable-timestamp.yml@main
+
+  pr_build_and_test:
+    if: github.event_name == 'pull_request'
+    needs: [Timestamp]
+    uses: storyprotocol/gha-workflows/.github/workflows/reusable-build-unit-test-workflow.yml@main
+    with:
+      sha: ${{ github.event.pull_request.head.sha }}
+      ENVIRONMENT: "aeneid"
+    secrets:
+      WALLET_PRIVATE_KEY: ${{ secrets.WALLET_PRIVATE_KEY }}
+      RPC_PROVIDER_URL: ${{ secrets.RPC_PROVIDER_URL }}
+
+  push_build_and_test:
+    if: github.event_name == 'push'
+    uses: storyprotocol/gha-workflows/.github/workflows/reusable-build-integration-test-workflow.yml@main
+    with:
+      sha: ${{ github.sha }}
+      ENVIRONMENT: "aeneid"
+    secrets:
+      WALLET_PRIVATE_KEY: ${{ secrets.WALLET_PRIVATE_KEY }}
+      RPC_PROVIDER_URL: ${{ secrets.RPC_PROVIDER_URL }}
+
+  lint:
+    name: Lint and Type Check
+    runs-on: ubuntu-latest
+    needs: [Timestamp]
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11"]
+    steps:
+      - name: Check out code
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
+      
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          
+      - name: Install dependencies
+        run: |
+          python -m venv .venv
+          source .venv/bin/activate
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt || exit 1
+          pip install ruff black mypy pytest pytest-cov
+        shell: bash
+          
+      - name: Run linting
+        run: |
+          source .venv/bin/activate
+          ruff check .
+          black --check .
+          
+      - name: Run type checking
+        run: |
+          source .venv/bin/activate
+          mypy src tests
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