diff --git a/src/distributed_execution/tightly_coupled/jobs.py b/src/distributed_execution/tightly_coupled/jobs.py
index 3b4abcf..c5f82f9 100644
--- a/src/distributed_execution/tightly_coupled/jobs.py
+++ b/src/distributed_execution/tightly_coupled/jobs.py
@@ -81,12 +81,19 @@ tightly_coupled_k8s_job = distributed_execution_reference.to_job(
         "Tightly coupled, one Kubernetes Job per step. Each step pod must reach the metadata "
         "database, object storage and Vault. Requires a cluster - not runnable locally."
     ),
-    executor_def=k8s_job_executor.configured(
-        {
-            "image_pull_policy": "IfNotPresent",
-            "step_k8s_config": STEP_K8S_CONFIG,
+    # Defaults go through `config` rather than `executor_def=...configured(...)`.
+    # `.configured()` collapses the executor's config schema to Any, so a run
+    # config `execution:` block is accepted and then silently discarded - which
+    # also makes job_image and job_namespace impossible to supply at launch time.
+    executor_def=k8s_job_executor,
+    config={
+        "execution": {
+            "config": {
+                "image_pull_policy": "IfNotPresent",
+                "step_k8s_config": STEP_K8S_CONFIG,
+            }
         }
-    ),
+    },
     tags={**COMMON_TAGS, "executor": "k8s_job"},
 )