POS & API

Case Study — 2024

POS & High-Performance API

Architecting Transactional Scale


The Objective

Design a fault-tolerant mobile Point of Sale system capable of maintaining operational integrity in challenging retail environments. The primary directive was seamless hardware integration and a robust hybrid offline mode to ensure zero transaction loss.

The Outcome

A resilient React Native engine backed by a high-throughput API architecture. Achieving sustained transaction rates exceeding 100+ TPS, with seamless background sync protocols when connectivity is restored, ensuring uninterrupted commerce flow.

Thermal Print Engine Sync
Fig. 1 — Thermal Print Engine Sync

Hardware Connect Protocol

The mobile client acts as a localized hub, interfacing directly with peripheral retail hardware via low-level protocols, bypassing standard OS bottlenecks for critical path operations.

01

React Native Core

Cross-platform UI execution with native bridge modules for hardware access.

02

BLE Printer Gateway

Direct Bluetooth Low Energy integration for thermal ESC/POS commands.

UI Mockup

Infrastructure & Topology


Application Layer

Framework
CodeIgniter 4
API Paradigm
RESTful JSON
Auth Protocol
JWT Stateless

Data Persistence

Primary DB
PostgreSQL
Local Cache
SQLite (Mobile)
In-Memory
Redis Store

Message Broker

Queue Engine
RabbitMQ
Sync Strategy
Event Sourcing
Throughput
100+ TPS