Salesforce holds the client relationship. Orders, invoices, stock and the official record normally sit in other systems, and we connect them: SAP or Odoo, the data platform and Government services, through MuleSoft or whichever integration platform you already run. Platform events and Change Data Capture keep the systems aligned during the day, so there are no surprises from a batch that ran overnight.
Where volumes are high we respect the platform limits from the first design: bulk APIs, asynchronous jobs and selective synchronisation in place of full copies. Our integrations and API team is responsible for the interface contracts on both sides.