diff --git a/.github/workflows/ci.yml b/.github/workflows/ci_centos7.yml
similarity index 75%
rename from .github/workflows/ci.yml
rename to .github/workflows/ci_centos7.yml
index c345c3186..253a4da67 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci_centos7.yml
@@ -24,6 +24,9 @@ jobs:
         with:
           cmake-version: '3.22.x'
       
+      - name: Checkout sources
+        uses: actions/checkout@v1
+
       - name: Install boost
         run: |  
           source /opt/rh/devtoolset-9/enable
@@ -32,35 +35,27 @@ jobs:
           cd boost_1_73_0
           ./bootstrap.sh --prefix=/usr/local
           ./b2 install --without-python -j 5
-
-      - name: Checkout sources
-        uses: actions/checkout@v1
-
+          cd ..
+        
       - name: Configure 3rd parties
         run: |
           source /opt/rh/devtoolset-9/enable
-          mkdir -p $GITHUB_WORKSPACE/metrix-simulator/build-linux/external
-          cd $GITHUB_WORKSPACE/metrix-simulator/build-linux/external
-          cmake $GITHUB_WORKSPACE/metrix-simulator/external
-
+          cmake -S $GITHUB_WORKSPACE/metrix-simulator/external -B $GITHUB_WORKSPACE/metrix-simulator/build-linux/external
+        
       - name: Build 3rd parties
         run: |
-          cmake --build $GITHUB_WORKSPACE/metrix-simulator/build-linux/external --parallel 5
+          cmake --build $GITHUB_WORKSPACE/metrix-simulator/build-linux/external --parallel 2
 
       - name: Configure CMake
         run: |
           source /opt/rh/devtoolset-9/enable
-          mkdir -p $GITHUB_WORKSPACE/metrix-simulator/build-linux
-          cd $GITHUB_WORKSPACE/metrix-simulator/build-linux
-          cmake $GITHUB_WORKSPACE/metrix-simulator -Wno-dev
-          -DCMAKE_BUILD_TYPE=Release
-          -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/metrix-simulator/build-linux/install
+          cmake -S $GITHUB_WORKSPACE/metrix-simulator -Wno-dev -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/metrix-simulator/build-linux/install -B $GITHUB_WORKSPACE/metrix-simulator/build-linux
 
       - name: Build
-        run: cmake --build $GITHUB_WORKSPACE/metrix-simulator/build-linux --target install --parallel 5
+        run: cmake --build $GITHUB_WORKSPACE/metrix-simulator/build-linux --target install --parallel 2
 
       - name: Tests
-        run: cd $GITHUB_WORKSPACE/metrix-simulator/build-linux && ctest -j8 --output-on-failure
+        run: cd $GITHUB_WORKSPACE/metrix-simulator/build-linux && ctest -j2 --output-on-failure
 
   qa:
     name: QA - CI
@@ -102,14 +97,19 @@ jobs:
         env:
           SONAR_SCANNER_VERSION: 3.3.0.1492
 
-      - name: Install Boost
-        run: |
-          sudo apt-get update -y
-          sudo apt-get install -y libboost-all-dev
-
       - name: Checkout sources
         uses: actions/checkout@v1
 
+      - name: Install boost
+        run: |  
+          source /opt/rh/devtoolset-9/enable
+          wget https://boostorg.jfrog.io/artifactory/main/release/1.73.0/source/boost_1_73_0.tar.gz
+          tar -xzvf ./boost_1_73_0.tar.gz
+          cd boost_1_73_0
+          ./bootstrap.sh --prefix=/usr/local
+          ./b2 install --without-python -j 5
+          cd ..
+
       - name: Configure 3rd parties
         run: |
           source /opt/rh/devtoolset-9/enable
@@ -122,17 +122,12 @@ jobs:
       - name: Configure CMake
         run: |
           source /opt/rh/devtoolset-9/enable
-          cmake -Wno-dev -S $GITHUB_WORKSPACE/metrix-simulator -B $GITHUB_WORKSPACE/metrix-simulator/build
-          -DCMAKE_BUILD_TYPE=Debug
-          -DCODE_COVERAGE=TRUE
-          -DMETRIX_RUN_ALL_TESTS=OFF
-          -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/metrix-simulator/build/install
+          cmake -Wno-dev -S $GITHUB_WORKSPACE/metrix-simulator -B $GITHUB_WORKSPACE/metrix-simulator/build -DCMAKE_BUILD_TYPE=Debug -DCODE_COVERAGE=TRUE -DMETRIX_RUN_ALL_TESTS=OFF -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/metrix-simulator/build/install
 
       - name: Build
-        run: >
-          ${{ runner.workspace }}/build-wrapper-linux-x86/build-wrapper-linux-x86-64
-          --out-dir $GITHUB_WORKSPACE/metrix-simulator/build/output
-          cmake --build $GITHUB_WORKSPACE/metrix-simulator/build --parallel 2 --target install
+        run: |
+          source /opt/rh/devtoolset-9/enable
+          ${{ runner.workspace }}/build-wrapper-linux-x86/build-wrapper-linux-x86-64 --out-dir $GITHUB_WORKSPACE/metrix-simulator/build/output cmake --build $GITHUB_WORKSPACE/metrix-simulator/build --parallel 2 --target install
 
       - name: Tests
         run: cd $GITHUB_WORKSPACE/metrix-simulator/build && ctest -j8 --output-on-failure
@@ -147,4 +142,4 @@ jobs:
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
         run: >
           ${{ runner.workspace }}/sonar/bin/sonar-scanner
-          -Dsonar.host.url=https://sonarcloud.io
+          -Dsonar.host.url=https://sonarcloud.io
\ No newline at end of file
diff --git a/.github/workflows/ci_ubuntu.yml b/.github/workflows/ci_ubuntu.yml
new file mode 100644
index 000000000..8263dd99e
--- /dev/null
+++ b/.github/workflows/ci_ubuntu.yml
@@ -0,0 +1,115 @@
+name: CI-cpp
+
+on: [push]
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  linux:
+    name: Linux
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Boost
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y libboost-all-dev
+
+      - name: Checkout sources
+        uses: actions/checkout@v1
+
+      - name: Configure 3rd parties
+        run: >
+          cmake -S $GITHUB_WORKSPACE/metrix-simulator/external -B $GITHUB_WORKSPACE/metrix-simulator/build-linux/external
+
+      - name: Build 3rd parties
+        run: >
+          cmake --build $GITHUB_WORKSPACE/metrix-simulator/build-linux/external --parallel 2
+
+      - name: Configure CMake
+        run: >
+          cmake -Wno-dev -S $GITHUB_WORKSPACE/metrix-simulator -B $GITHUB_WORKSPACE/metrix-simulator/build-linux
+          -DCMAKE_BUILD_TYPE=Release
+          -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/metrix-simulator/build-linux/install
+
+      - name: Build
+        run: cmake --build $GITHUB_WORKSPACE/metrix-simulator/build-linux --target install --parallel 2
+
+      - name: Tests
+        run: cd $GITHUB_WORKSPACE/metrix-simulator/build-linux && ctest -j8 --output-on-failure
+
+  qa:
+    name: QA - CI
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Java 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Install gcovr
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y gcovr
+
+      - name: Install Sonar wrapper
+        working-directory: ${{ runner.workspace }}
+        run: |
+          wget https://sonarcloud.io/static/cpp/build-wrapper-linux-x86.zip
+          unzip build-wrapper-linux-x86.zip
+
+      - name: Install Sonar scanner
+        working-directory: ${{ runner.workspace }}
+        run: |
+          wget https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-${SONAR_SCANNER_VERSION}.zip
+          unzip sonar-scanner-cli-${SONAR_SCANNER_VERSION}.zip
+          ln -s sonar-scanner-${SONAR_SCANNER_VERSION} sonar
+          rm sonar-scanner-cli-${SONAR_SCANNER_VERSION}.zip
+        env:
+          SONAR_SCANNER_VERSION: 3.3.0.1492
+
+      - name: Install Boost
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y libboost-all-dev
+
+      - name: Checkout sources
+        uses: actions/checkout@v1
+
+      - name: Configure 3rd parties
+        run: >
+          cmake -S $GITHUB_WORKSPACE/metrix-simulator/external -B $GITHUB_WORKSPACE/metrix-simulator/build/external
+
+      - name: Build 3rd parties
+        run: >
+          cmake --build $GITHUB_WORKSPACE/metrix-simulator/build/external --parallel 2
+
+      - name: Configure CMake
+        run: >
+          cmake -Wno-dev -S $GITHUB_WORKSPACE/metrix-simulator -B $GITHUB_WORKSPACE/metrix-simulator/build
+          -DCMAKE_BUILD_TYPE=Debug
+          -DCODE_COVERAGE=TRUE
+          -DMETRIX_RUN_ALL_TESTS=OFF
+          -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/metrix-simulator/build/install
+
+      - name: Build
+        run: >
+          ${{ runner.workspace }}/build-wrapper-linux-x86/build-wrapper-linux-x86-64
+          --out-dir $GITHUB_WORKSPACE/metrix-simulator/build/output
+          cmake --build $GITHUB_WORKSPACE/metrix-simulator/build --parallel 2 --target install
+
+      - name: Tests
+        run: cd $GITHUB_WORKSPACE/metrix-simulator/build && ctest -j8 --output-on-failure
+
+      - name: Code coverage
+        run: cmake --build $GITHUB_WORKSPACE/metrix-simulator/build --target code-coverage
+
+      - name: Sonarcloud
+        working-directory: ${{ runner.workspace }}/powsybl-metrix/metrix-simulator
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        run: >
+          ${{ runner.workspace }}/sonar/bin/sonar-scanner
+          -Dsonar.host.url=https://sonarcloud.io