Multi-outlet menu, inventory & POS
A central head-office system for a food and beverage chain. HQ owns the master menu and outlet pricing, every outlet runs its own POS and stock, and sales roll up into live revenue and best-seller reports.
Project Overview
A restaurant group with several outlets needs one source of truth for the menu, while each outlet still controls its own prices, stock and counter. This platform does exactly that: one company, many outlets. HQ assigns the menu, outlets make sales, and HQ sees the reports.
The HQ console manages the master catalogue, assigns items to specific outlets and overrides prices per outlet. Each outlet terminal sees only its assigned items at the effective price. Staff ring up multi-item orders, track stock (restock, wastage, correction) and review every receipt.
The engineering focus was correctness under real-world load. Every sale runs in a single database transaction that locks stock rows in a fixed order (so concurrent sales can't deadlock), validates the whole cart, deducts stock with a guarded update and issues a sequential, gap-free receipt number per outlet. Idempotency keys make network retries and offline replays safe.
This behaviour is backed by 40 integration tests against a real PostgreSQL database. For example, 30 concurrent sales against a stock of 10 produce exactly 10 successes and receipts numbered exactly 1 to 10.
Feature Tour
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Company-wide revenue, transactions, average ticket and outlet count, plus revenue by outlet, filterable by period.
The Challenge
Multi-outlet F&B operators lose control when menus, prices and stock live in separate spreadsheets per branch. Under rush-hour concurrency, naive POS systems oversell stock, skip or duplicate receipt numbers, and double-charge on network retries, and HQ never gets a trustworthy revenue picture.
Our Solution
We built a role-separated HQ console and outlet POS on a layered Express and PostgreSQL API. Row-level locking, guarded stock updates, a per-outlet receipt counter and idempotency keys guarantee that sales, stock and receipts always reconcile, even when many terminals sell the same item at the same moment.
Modules in Detail
Key Features
HQ master menu & catalogue
Per-outlet assignment & price overrides
Touch-friendly outlet POS
Per-outlet stock with restock/wastage
Sequential, gap-free receipts
Revenue by outlet & top-5 sellers
Idempotent, retry-safe checkout
Role-based HQ & outlet access
Final Outcome
A production-grade, fully tested platform where the head office controls the menu and pricing centrally, outlets sell independently, and every receipt, stock movement and revenue figure reconciles exactly, even under concurrent load.
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