Developed a Custom Order Status Update API for the matmair/InvenTree repository, enabling PATCH requests to update an order’s custom status key with validation against the current order status. The implementation involved refactoring the custom_status_key to be writable through the API, ensuring only valid statuses could be applied, and updating the status_text serializer to reflect custom status labels in API responses. Focused on code quality and performance, the work included targeted unit tests to verify integrity and guard against N+1 query issues. Utilized Python, Django, and API development best practices, and updated API versioning to support the new endpoint semantics.