diff --git a/.github/workflows/matchers/mypy.json b/.github/workflows/matchers/mypy.json
new file mode 100644
index 0000000..cb29a09
--- /dev/null
+++ b/.github/workflows/matchers/mypy.json
@@ -0,0 +1,18 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "mypy",
+            "severity": "error",
+            "pattern": [
+                {
+                    "regexp": "^(\\S*):(\\d+):(\\d+): ([a-z]+): (.*)$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3,
+                    "severity": 4,
+                    "message": 5
+                }
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.github/workflows/mypy.yaml b/.github/workflows/mypy.yaml
new file mode 100644
index 0000000..42f1749
--- /dev/null
+++ b/.github/workflows/mypy.yaml
@@ -0,0 +1,68 @@
+name: mypy
+
+on:
+  - pull_request
+
+jobs:
+  mypy:
+    defaults:
+      run:
+        shell: bash
+    strategy:
+      fail-fast: true
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        python-version: ["3.9", "3.10", "3.11"]
+    runs-on: ${{ matrix.os }}
+    steps:
+      #----------------------------------------------
+      #       check-out repo and set-up python
+      #----------------------------------------------
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Set up python ${{ matrix.python-version }}
+        id: setup-python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      #----------------------------------------------
+      #        -----  install poetry  -----
+      #----------------------------------------------
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      #----------------------------------------------
+      #      install or use cached dependencies
+      #----------------------------------------------
+      - name: Load cached venv
+        id: cached-poetry-dependencies
+        uses: actions/cache@v3
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-python-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+      - name: Install dependencies
+        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+        run: poetry install --no-interaction --no-root
+
+      # always install current root package
+      - name: Install library
+        run: poetry install --no-interaction
+
+      #----------------------------------------------
+      #  -----  setup matchers & run mypy   -----
+      #----------------------------------------------
+      - name: Setup matchers
+        run: |
+          echo "::add-matcher::.github/workflows/matchers/mypy.json"
+          echo "TERM: changing from $TERM -> xterm"
+          export TERM=xterm
+      - name: Run mypy
+        # NOTE: tomli is sometimes missing, install it explicitly
+        run: |
+          source $VENV
+          pip install tomli
+          mypy --show-column-numbers .
diff --git a/.github/workflows/ruff.yaml b/.github/workflows/ruff.yaml
new file mode 100644
index 0000000..3220d0f
--- /dev/null
+++ b/.github/workflows/ruff.yaml
@@ -0,0 +1,65 @@
+name: Ruff
+
+on:
+  - pull_request
+
+jobs:
+  Ruff:
+    defaults:
+      run:
+        shell: bash
+    strategy:
+      fail-fast: true
+      matrix:
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        python-version: ["3.9", "3.10", "3.11"]
+    runs-on: ${{ matrix.os }}
+    steps:
+      #----------------------------------------------
+      #       check-out repo and set-up python
+      #----------------------------------------------
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Set up python ${{ matrix.python-version }}
+        id: setup-python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      #----------------------------------------------
+      #        -----  install poetry  -----
+      #----------------------------------------------
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      #----------------------------------------------
+      #      install or use cached dependencies
+      #----------------------------------------------
+      - name: Load cached venv
+        id: cached-poetry-dependencies
+        uses: actions/cache@v3
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-python-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+      - name: Install dependencies
+        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+        run: poetry install --no-interaction --no-root
+
+      # always install current root package
+      - name: Install library
+        run: poetry install --no-interaction
+
+      #----------------------------------------------
+      #            -----  run ruff   -----
+      #----------------------------------------------
+      - name: Run Ruff Check
+        run: |
+          source $VENV
+          ruff check --output-format=github .
+      - name: Run Ruff Format Check
+        run: |
+          source $VENV
+          ruff format --check .