The comprehensive architectural guide to building offline-first restaurant POS platforms with embedded SQLite sync, real-time WebSocket bump bars, and automated raw-ingredient inventory depletion.
Restaurant tickets need durable kitchen acknowledgements
Model checks, check_lines, kitchen_tickets, station_events and refunds. Freeze priced line items at sale time. Keep payment and kitchen state separate so an accepted card transaction does not imply that a printer received the ticket.
Workflow and data ownership
POS order → payment state → kitchen ticket → station acknowledgement → fulfilment
Confirm each system of record, the event owner and the recovery path before implementation. The sequence above is a proposed design for discussion, not measured production performance.
3. The 8 Core Functional Modules Included in This Architecture
The custom platform is engineered with eight deeply integrated operational modules designed specifically for Restaurant & Food Service POS:
Offline-First Local Area Network (LAN) Sync with Embedded SQLite Nodes
Offline-First Local Area Network (LAN) Sync with Embedded SQLite Nodes
Real-Time Kitchen Display Screen (KDS) Station Split Routing via WebSockets
Real-Time Kitchen Display Screen (KDS) Station Split Routing via WebSockets
Automated Recipe Yield & Raw Ingredient Inventory Depletion Engine
Automated Recipe Yield & Raw Ingredient Inventory Depletion Engine
Direct ESC/POS Thermal Receipt & Kitchen Order Ticket (KOT) Printing
Direct ESC/POS Thermal Receipt & Kitchen Order Ticket (KOT) Printing
QR Contactless Table Ordering & Direct Apple Pay / Google Pay Settlement
QR Contactless Table Ordering & Direct Apple Pay / Google Pay Settlement
Table Layout Visual Floor Plan Editor with Live Occupancy Color Coding
Table Layout Visual Floor Plan Editor with Live Occupancy Color Coding
Server Tip Distribution & Shift-End Cash Drawer Balance Auditing
Server Tip Distribution & Shift-End Cash Drawer Balance Auditing
Multi-Branch Central Menu & Dynamic Pricing Synchronization
Multi-Branch Central Menu & Dynamic Pricing Synchronization
Failure cases and acceptance checks
Disconnect the network mid-order; reconnect without duplicate tickets; void one item after kitchen acknowledgement; reconcile cash and card separately at shift close.
Scope, measurement and handover
Agree the first release, test data, permissions and acceptance evidence in writing. Record the current operating baseline before setting targets. Hand over the accepted code, configuration and runbook under the project agreement; hosting, external APIs and maintenance remain separate budget items. Review the related service or guide.