Modern Odoo implementations should follow a layered architecture.
Experience Layer: Web, Mobile, Customer Portal, Vendor Portal, APIs
Business Application Layer: CRM, Sales, Purchase, Inventory, Manufacturing, Accounting, HR, Projects, Helpdesk, Website, eCommerce
Business Logic Layer: Automation, Business Rules, Approval Workflows, Scheduled Actions, Reports, Dashboards
Integration Layer: Shopify, WooCommerce, Adobe Commerce, Microsoft 365, Google Workspace, QuickBooks, Xero, Payment Gateways, Shipping Providers, Banking APIs, Third-Party Applications
Data Layer: Reporting, Analytics, Business Intelligence, Audit Trails, Operational Visibility
Security Layer: RBAC, Multi-company security, Approval controls, Audit logs, API security, Identity management