diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index 8579a2d..bbd5b0f 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -79,6 +79,7 @@ jobs:
     - name: Test with pytest
       run: |
         uv run pytest --cov-report xml:coverage.xml --junitxml=pytest.xml --cov-fail-under=80
+      continue-on-error: true  # Always continue to upload reports
 
     - name: Upload coverage and test reports
       # Upload coverage report only once to avoid redundancy
@@ -100,6 +101,19 @@ jobs:
         # No shallow clone for a better analysis
         fetch-depth: 0
 
+    - name: Set up Python 3.13
+      uses: actions/setup-python@v3
+      with:
+        python-version: 3.13
+    - name: Install Mypy
+      run: |
+        python -m pip install mypy django-stubs types-pywin32
+
+    - name: Run MyPy
+      run: |
+        mypy --strict --junit-xml mypy.xml src
+      continue-on-error: true
+
     - name: Download coverage report
       uses: actions/download-artifact@v4
       with:
@@ -110,4 +124,9 @@ jobs:
       env:
         SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
         SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
-        url: ${{ secrets.SONAR_HOST_URL }}/dashboard?id=django-windowsauthtoken
+
+    - name: SonarQube Quality Gate check
+      uses: sonarsource/sonarqube-quality-gate-action@v1.2.0
+      env:
+        SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
diff --git a/pyproject.toml b/pyproject.toml
index 06dc38d..4e78c97 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,3 +62,6 @@ source = ["django_windowsauthtoken"]
 
 [tool.pytest.ini_options]
 addopts = "--cov --cov-report=term-missing"
+
+[tool.mypy]
+strict = true
diff --git a/sonar-project.properties b/sonar-project.properties
index bba5c25..947b2fe 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -5,3 +5,4 @@ sonar.sources = src
 sonar.tests = tests
 sonar.python.coverage.reportPaths=coverage.xml
 sonar.python.xunit.reportPath=pytest.xml
+sonar.python.mypy.reportPaths=mypy.xml
diff --git a/src/django_windowsauthtoken/middleware.py b/src/django_windowsauthtoken/middleware.py
index 99d272f..82e9404 100644
--- a/src/django_windowsauthtoken/middleware.py
+++ b/src/django_windowsauthtoken/middleware.py
@@ -1,8 +1,10 @@
 import logging
 import os
+from typing import Callable
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
+from django.http import HttpRequest, HttpResponse
 from django.utils.module_loading import import_string
 
 from .formatters import DEFAULT_FORMATTER, FormattingError
@@ -16,12 +18,12 @@
     import pywintypes
     import win32api
     import win32security
-except ImportError:
-    if _IGNORE_PYWIN32_ERRORS:  # pragma: no cover
+except ImportError:  # pragma: no cover
+    if _IGNORE_PYWIN32_ERRORS:
         logger.warning("pywin32 is not installed, but errors are being ignored.")
-    pywintypes = None
-    win32api = None
-    win32security = None
+    pywintypes = None  # type: ignore[assignment]
+    win32api = None  # type: ignore[assignment]
+    win32security = None  # type: ignore[assignment]
 
 
 class WindowsAuthTokenMiddleware:
@@ -34,14 +36,14 @@ class WindowsAuthTokenMiddleware:
     header_name = "X-IIS-WindowsAuthToken"
     """The HTTP header name where the Windows Authentication Token is expected."""
 
-    def __init__(self, get_response):
+    def __init__(self, get_response: Callable[[HttpRequest], HttpResponse]) -> None:
         self.get_response = get_response
         self.username_formatter: str = getattr(settings, "WINDOWSAUTHTOKEN_USERNAME_FORMATTER", DEFAULT_FORMATTER)
 
         if not any([win32security, pywintypes, win32api]) and not _IGNORE_PYWIN32_ERRORS:
             raise ImproperlyConfigured("pywin32 is required for Windows Authentication Token middleware.'")
 
-    def __call__(self, request):
+    def __call__(self, request: HttpRequest) -> HttpResponse:
         auth_token = request.headers.get(self.header_name, "")
         if auth_token:
             try:
@@ -135,5 +137,5 @@ def format_username(self, user: str, domain: str) -> str:
         Raises:
             FormattingError: If the formatter raises an error.
         """
-        formatter = import_string(self.username_formatter)
+        formatter: Callable[[str, str], str] = import_string(self.username_formatter)
         return formatter(user, domain)
diff --git a/src/django_windowsauthtoken/views.py b/src/django_windowsauthtoken/views.py
index 6320418..4682444 100644
--- a/src/django_windowsauthtoken/views.py
+++ b/src/django_windowsauthtoken/views.py
@@ -1,10 +1,10 @@
 from django.conf import settings
-from django.http import JsonResponse
+from django.http import HttpRequest, JsonResponse
 from django.views.decorators.http import require_GET
 
 
 @require_GET
-def debug_view(request):
+def debug_view(request: HttpRequest) -> JsonResponse:
     """
     A simple debug view that returns the current user's username and domain.
     """
@@ -22,7 +22,7 @@ def debug_view(request):
             # State of the user object
             "user.is_authenticated": request.user.is_authenticated,
             "user.is_anonymous": request.user.is_anonymous,
-            "user.username": request.user.username if request.user.is_authenticated else "N/A",
+            "user.username": request.user.get_username() if request.user.is_authenticated else "N/A",
             # Full request representation for deeper debugging if needed, mainly ASGI/WSGI differences
             "request": str(request),
             # Full META dump for deeper debugging if needed
diff --git a/tests/test_middleware.py b/tests/test_middleware.py
index 47eec4b..5ddf0f8 100644
--- a/tests/test_middleware.py
+++ b/tests/test_middleware.py
@@ -270,4 +270,4 @@ async def test_combine_with_remote_user_middleware_async(mocker, settings, async
     assert await User.objects.acount() == 1, "User should be created by RemoteUserMiddleware"
     user = await User.objects.afirst()
     assert user == response.asgi_request.user
-    assert user.username == r"TESTDOMAIN\testuser"
+    assert user.get_username() == r"TESTDOMAIN\testuser"