diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..5f32310
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,18 @@
+name: ci 
+
+on:
+  push:
+    branches: [ develop ]
+  pull_request:
+    branches: [ develop ]
+
+concurrency:
+  group: ci-${{github.ref}}-${{github.event.pull_request.number || github.run_number}}
+  cancel-in-progress: true
+
+jobs:
+  formatting:
+    uses: ./.github/workflows/formatting.yaml
+  nvidia-gpu:
+    needs:  [ formatting ]
+    uses: ./.github/workflows/nvidia-rtx-3090-tests.yaml       
diff --git a/.github/workflows/formatting-tests.yaml b/.github/workflows/formatting.yaml
similarity index 71%
rename from .github/workflows/formatting-tests.yaml
rename to .github/workflows/formatting.yaml
index 5d09fa9..7cdac5c 100644
--- a/.github/workflows/formatting-tests.yaml
+++ b/.github/workflows/formatting.yaml
@@ -1,18 +1,16 @@
 name: formatting tests
 
 on:
-  push:
-    branches: [ develop ]
-  pull_request:
-    branches: [ develop ]
+  workflow_dispatch:
+  workflow_call:
+
+concurrency:
+  group: unit_tests-${{github.ref}}-${{github.event.pull_request.number || github.run_number}}
+  cancel-in-progress: true
 
 jobs:
   formatting:
-    runs-on: ${{ matrix.os }}
-
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
+    runs-on: [ubuntu-latest]
 
     steps:
     - uses: actions/checkout@v2
@@ -34,3 +32,4 @@ jobs:
       run: |
         black --diff --check .
         flake8
+
diff --git a/.github/workflows/nvidia-tests.yaml b/.github/workflows/nvidia-rtx-3090-tests.yaml
similarity index 85%
rename from .github/workflows/nvidia-tests.yaml
rename to .github/workflows/nvidia-rtx-3090-tests.yaml
index 3827c8b..266841c 100644
--- a/.github/workflows/nvidia-tests.yaml
+++ b/.github/workflows/nvidia-rtx-3090-tests.yaml
@@ -1,10 +1,12 @@
 name: nvidia-rtx-3090 tests
 
 on:
-  push:
-    branches: [ develop ]
-  pull_request:
-    branches: [ develop ]
+  workflow_dispatch:
+  workflow_call:
+
+concurrency:
+  group: unit_tests-${{github.ref}}-${{github.event.pull_request.number || github.run_number}}
+  cancel-in-progress: true
 
 jobs:
   inter-layer:
@@ -13,7 +15,8 @@ jobs:
     strategy:
       matrix:
         ginter: [ 1, 2 ]
-        memopt: [ '0', '1' ] 
+        memopt: [ '0', '1' ]
+
     steps:
     - uses: actions/checkout@v3
     - name: Install AxoNN
@@ -36,6 +39,7 @@ jobs:
 
   intra-layer:
     runs-on: [ nvidia ]
+
     steps:
     - uses: actions/checkout@v3
     - name: Install AxoNN