diff --git a/schedule/src/schedule/domain/__init__.py b/schedule/src/schedule/domain/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/schedule/src/schedule/domain/context.py b/schedule/src/schedule/domain/context.py
new file mode 100644
index 0000000..143e5c9
--- /dev/null
+++ b/schedule/src/schedule/domain/context.py
@@ -0,0 +1,41 @@
+"""Shared constants and timezone helpers for the scheduler components.
+
+Designed to be import-side-effect-free: no logging, no I/O, no model imports.
+Used by ``scheduler``, ``orchestrator`` and ``worker`` modules.
+"""
+
+from __future__ import annotations
+
+from datetime import UTC, datetime
+
+TERMINAL_NODE_STATES = frozenset({
+    "succeeded",
+    "failed",
+    "skipped",
+    "cancelled",
+    "timed_out",
+})
+FAILED_NODE_STATES = frozenset({"failed", "cancelled", "timed_out"})
+TERMINAL_RUN_STATES = frozenset({
+    "succeeded",
+    "failed",
+    "cancelled",
+    "timed_out",
+})
+
+
+def naive_utc(value: datetime | None) -> datetime | None:
+    """Normalize a datetime to naive UTC; pass through ``None``."""
+    if value is None:
+        return None
+    if value.tzinfo is None:
+        value = value.replace(tzinfo=UTC)
+    return value.astimezone(UTC).replace(tzinfo=None)
+
+
+__all__ = [
+    "FAILED_NODE_STATES",
+    "TERMINAL_NODE_STATES",
+    "TERMINAL_RUN_STATES",
+    "naive_utc",
+]
diff --git a/schedule/src/schedule/domain/execution.py b/schedule/src/schedule/domain/execution.py
new file mode 100644
index 0000000..ceb355d
--- /dev/null
+++ b/schedule/src/schedule/domain/execution.py
@@ -0,0 +1,21 @@
+"""Domain types for schedule node execution.
+
+Pure value objects — no I/O, no logging, no model imports. Safe to import
+from any layer.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class ExecutionResult:
+    status: str
+    exit_code: int | None
+    logs: bytes
+    result: bytes
+    result_file_name: str
+    result_content_type: str
+    error_code: str | None = None
+    error_message: str | None = None