diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..7564275
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,28 @@
+version: 2.1
+
+orbs:
+  codecov: codecov/codecov@4.0.1
+
+permissions:
+  id-token: write # This is required for requesting the JWT
+  contents: read  # This is required for actions/checkout
+
+jobs:
+  test-api:
+    docker:
+      - image: cimg/python:3.10.2
+    steps:
+      - checkout
+      - run:
+          name: Install requirements
+          command: pip install -r api/requirements.txt
+      - run:
+          name: Run tests and collect coverage
+          command: pytest --cov api.calculator
+      - codecov/upload
+
+workflows:
+  version: 2.1
+  build-test:
+    jobs:
+      - test-api
\ No newline at end of file
diff --git a/.github/workflows/api.yml b/.github/workflows/api.yml
new file mode 100644
index 0000000..5f24d2c
--- /dev/null
+++ b/.github/workflows/api.yml
@@ -0,0 +1,25 @@
+name: API workflow
+
+on: [push, pull_request]
+
+permissions:
+  id-token: write # This is required for requesting the JWT
+  contents: read  # This is required for actions/checkout
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Test python API
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.10'
+    - name: Install requirements
+      run: pip install -r api/requirements.txt
+    - name: Run tests and collect coverage
+      run: pytest --cov=api.calculator --cov-report=xml
+    - name: Upload coverage reports to Codecov with GitHub Action
+      uses: codecov/codecov-action@v4.2.0
+      with:
+        use_oidc: true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cfa4ab2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+*.py[oc]
+__pycache__
+.coverage
+.pytest_cache/
+coverage.xml
+node_modules/
+coverage/
diff --git a/README.md b/README.md
index e0cad3c..1faf404 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,2 @@
-# oidc-test
\ No newline at end of file
+# oidc-test
+used pyenv virtualenv 3.12.2 temp
\ No newline at end of file
diff --git a/api/__init__.py b/api/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/api/app.py b/api/app.py
new file mode 100644
index 0000000..046e026
--- /dev/null
+++ b/api/app.py
@@ -0,0 +1,35 @@
+from flask import (
+    Flask,
+    request,
+)
+
+from calculator.calculator import Calculator
+
+app = Flask(__name__)
+
+@app.route('/api/add', methods=['POST'])
+def add():
+    return operation('add', 2)
+
+@app.route('/api/subtract', methods=['POST'])
+def subtract():
+    return operation('subtract', 2)
+
+@app.route('/api/multiply', methods=['POST'])
+def multiply():
+    return operation('multiply', 2)
+
+@app.route('/api/divide', methods=['POST'])
+def divide():
+    return operation('divide', 2)
+
+def operation(method, num_factors):
+    factors = []
+    if num_factors == 2:
+        factors.append(float(request.json.get('x')))
+        factors.append(float(request.json.get('y')))
+
+    return str(getattr(Calculator, method)(*factors))
+
+
+app.run(host='0.0.0.0', port=8080)
diff --git a/api/calculator/__init__.py b/api/calculator/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/api/calculator/calculator.py b/api/calculator/calculator.py
new file mode 100644
index 0000000..ab6c338
--- /dev/null
+++ b/api/calculator/calculator.py
@@ -0,0 +1,14 @@
+class Calculator:
+    def add(x, y):
+        return x + y
+
+    def subtract(x, y):
+        return x - y
+
+    def multiply(x, y):
+        return x * y
+
+    def divide(x, y):
+        if y == 0:
+            return 'Cannot divide by 0'
+        return x * 1.0 / y
diff --git a/api/calculator/test_calculator.py b/api/calculator/test_calculator.py
new file mode 100644
index 0000000..4164bee
--- /dev/null
+++ b/api/calculator/test_calculator.py
@@ -0,0 +1,30 @@
+from .calculator import Calculator
+
+
+def test_add():
+    assert Calculator.add(1, 2) == 3.0
+    assert Calculator.add(1.0, 2.0) == 3.0
+    assert Calculator.add(0, 2.0) == 2.0
+    assert Calculator.add(2.0, 0) == 2.0
+    assert Calculator.add(-4, 2.0) == -2.0
+
+def test_subtract():
+    assert Calculator.subtract(1, 2) == -1.0
+    assert Calculator.subtract(2, 1) == 1.0
+    assert Calculator.subtract(1.0, 2.0) == -1.0
+    assert Calculator.subtract(0, 2.0) == -2.0
+    assert Calculator.subtract(2.0, 0.0) == 2.0
+    assert Calculator.subtract(-4, 2.0) == -6.0
+
+def test_multiply():
+    assert Calculator.multiply(1, 2) == 2.0
+    assert Calculator.multiply(1.0, 2.0) == 2.0
+    assert Calculator.multiply(0, 2.0) == 0.0
+    assert Calculator.multiply(2.0, 0.0) == 0.0
+    assert Calculator.multiply(-4, 2.0) == -8.0
+
+def test_divide():
+    assert Calculator.divide(1, 2) == 0.5
+    assert Calculator.divide(1.0, 2.0) == 0.5
+    assert Calculator.divide(0, 2.0) == 0
+    assert Calculator.divide(-4, 2.0) == -2.0
diff --git a/api/requirements.txt b/api/requirements.txt
new file mode 100644
index 0000000..262d521
--- /dev/null
+++ b/api/requirements.txt
@@ -0,0 +1,13 @@
+blinker==1.8.2
+click==8.1.7
+coverage==7.6.1
+Flask==3.0.3
+iniconfig==2.0.0
+itsdangerous==2.2.0
+Jinja2==3.1.4
+MarkupSafe==2.1.5
+packaging==24.1
+pluggy==1.5.0
+pytest==8.3.3
+pytest-cov==5.0.0
+Werkzeug==3.0.4