diff --git a/onyxia-api/src/main/resources/schemas/nodeSelector-gpu.json b/onyxia-api/src/main/resources/schemas/nodeSelector-gpu.json
new file mode 100644
index 00000000..a4dab59c
--- /dev/null
+++ b/onyxia-api/src/main/resources/schemas/nodeSelector-gpu.json
@@ -0,0 +1,14 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Node Selector",
+    "type": "object",
+    "description": "Node selector constraints for the pod",
+    "additionalProperties": {
+      "type": "string",
+      "description": "Key-value pairs to select nodes"
+    },
+    "x-onyxia": {
+        "hidden": false,
+        "overwriteDefaultWith": "region.nodeSelector"
+    }
+}
\ No newline at end of file
diff --git a/onyxia-api/src/main/resources/schemas/spark.json b/onyxia-api/src/main/resources/schemas/spark.json
new file mode 100644
index 00000000..3200929d
--- /dev/null
+++ b/onyxia-api/src/main/resources/schemas/spark.json
@@ -0,0 +1,47 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Spark",
+    "type": "object",
+    "description": "spark specific configuration",
+    "properties": {
+      "sparkui": {
+        "type": "boolean",
+        "title": "SparkUI",
+        "description": "Enable Spark monitoring interface",
+        "default": true
+      },
+      "default": {
+        "type": "boolean",
+        "title": "Create a spark config",
+        "description": "Create a default spark config in spark-default.conf",
+        "default": true
+      },
+      "disabledCertChecking": {
+        "title": "Disable certificate checking ",
+        "type": "boolean",
+        "description": "Disable certificate checking for your S3 storage, do not use it in production",
+        "default": false
+      },
+      "userConfig": {
+        "type": "object",
+        "title": "Create a spark config",
+        "description": "Create a default spark config in spark-default.conf",
+        "default": {
+          "spark.dynamicAllocation.enabled": "true",
+          "spark.dynamicAllocation.initialExecutors": "1",
+          "spark.dynamicAllocation.minExecutors": "1",
+          "spark.dynamicAllocation.maxExecutors": "10",
+          "spark.executor.memory": "2g",
+          "spark.driver.memory": "2g",
+          "spark.dynamicAllocation.executorAllocationRatio": "1",
+          "spark.dynamicAllocation.shuffleTracking.enabled": "true",
+          "spark.hadoop.fs.s3a.bucket.all.committer.magic.enabled": "true"
+        },
+        "hidden": {
+          "value": false,
+          "path": "default",
+          "isPathRelative": true
+        }
+      }
+    }
+}
\ No newline at end of file