diff --git a/internal/domain/question_type_builder.go b/internal/domain/question_type_builder.go
index 13d1594..fd95582 100644
--- a/internal/domain/question_type_builder.go
+++ b/internal/domain/question_type_builder.go
@@ -221,7 +221,11 @@ func ResolveRuntimeQuestionTypeFromDefinition(key string, responseKinds []string
 		return "TRUE_FALSE"
 	}
 
+	hasNonAuxiliary := false
 	for _, kind := range normalizeKindList(responseKinds) {
+		if _, aux := responseKindsAuxiliary[kind]; !aux {
+			hasNonAuxiliary = true
+		}
 		switch kind {
 		case string(ResponseAudioResponse):
 			return "AUDIO"
@@ -237,6 +241,11 @@ func ResolveRuntimeQuestionTypeFromDefinition(key string, responseKinds []string
 		}
 	}
 
+	// Builder-native response kinds should still be persistable/executable as DYNAMIC.
+	if hasNonAuxiliary {
+		return "DYNAMIC"
+	}
+
 	return ""
 }
 
diff --git a/internal/domain/question_type_builder_test.go b/internal/domain/question_type_builder_test.go
index 1d3e45d..c105433 100644
--- a/internal/domain/question_type_builder_test.go
+++ b/internal/domain/question_type_builder_test.go
@@ -86,6 +86,13 @@ func TestResolveRuntimeQuestionTypeFromDefinition_skipsAuxiliaryKinds(t *testing
 	}
 }
 
+func TestResolveRuntimeQuestionTypeFromDefinition_builderNativeKinds(t *testing.T) {
+	got := ResolveRuntimeQuestionTypeFromDefinition("dynamic_builder", []string{"OPTION", "ANSWER_TIMER"})
+	if got != "DYNAMIC" {
+		t.Fatalf("expected DYNAMIC, got %q", got)
+	}
+}
+
 func TestValidatePersistableQuestionTypeDefinition_unmappable(t *testing.T) {
 	err := ValidatePersistableQuestionTypeDefinition("custom", []string{"ANSWER_TIMER"})
 	if err == nil || !strings.Contains(err.Error(), "unable to map definition") {