How do you handle PCI DSS compliance?

We use certified payment terminals — Stripe Terminal or Square hardware — which keep card data off the application entirely. That dramatically reduces the PCI compliance scope, since the terminal handles all card data and the app only receives a payment token. We design the payment architecture around minimising scope rather than maximising it.

Can you integrate with our inventory system?

Yes. We integrate with major inventory and ERP systems through their APIs, with real-time stock deduction on every sale and low-stock alerts configured to your reorder thresholds. The specific integration depends on your system and what it exposes for third-party connection, confirmed during discovery.

Can the POS run on iPad or Android tablet?

Both, depending on your hardware requirements. iPad is the most common platform for retail and restaurant POS due to the breadth of supported peripherals. Android tablets work well where specific hardware is already deployed. We confirm the hardware environment during discovery before recommending a platform.

Can you add loyalty and customer tracking to the POS?

Yes. Customer account lookup at checkout, loyalty point accrual and redemption, purchase history, and targeted promotion delivery can all be built into the POS. If a loyalty program already exists in a third-party platform, we build the integration rather than replacing what is already working.

POS App Development Company | Stateside Digitals

Generic POS systems are built to serve the average business, which means they serve no specific operation particularly well. A restaurant with complex modifier logic, a market with multiple vendors requiring split payments at the terminal, or a mobile business that processes transactions in locations without reliable internet all hit the limits of what Square and Lightspeed accommodate before they reach the limits of what they need to do.

A custom POS is also the integration layer that connects physical transactions to the digital systems a business already runs. Inventory that updates the moment a sale is made, sales data that flows directly into accounting software, and customer purchase history that feeds a loyalty program all require a POS that was built to connect to those systems rather than one that exports a CSV file and hopes someone imports it.

01

Sales Interface and Checkout Flow

Product and menu lookup, quantity and modifier management, discount and promotion application, and a checkout flow that moves fast enough that a queue does not form behind it.

02

Hardware and Payment Integration

Card reader, receipt printer, cash drawer, and barcode scanner integration through Stripe Terminal or Square hardware, keeping card data off the app and the PCI compliance scope as narrow as possible.

03

Inventory and Reporting Sync

Real-time inventory deduction on every sale, end-of-day reports, sales analytics by product and category, and integration with the accounting or ERP system the business already uses.

A product-based point of sale for retail businesses with barcode scanning, inventory management, customer accounts, loyalty integration, and end-of-day reporting by register and location.

A restaurant or café POS with table and order management, kitchen display integration, menu modifiers, split-check and tip handling, and tab management for bar and quick-service operations.

A portable point of sale for markets, festivals, pop-up retail, and field sales, built for offline transaction queuing, battery-optimised operation, and rapid hardware setup and teardown.

A cashier who has worked with Square or Toast arrives at a custom POS with muscle memory for how a transaction should flow. Scanning a product or selecting a menu item needs to be fast. Checkout should take seconds, not require navigating four screens. A voided transaction should not require a manager’s code for routine corrections. The speed and the feel of the interface determine whether staff adopt it or work around it, and resistance from staff is how a POS investment fails.

The offline requirement is not optional for any business where a lost internet connection would stop sales. A POS that goes down when the broadband drops is a POS that costs the business revenue and trust from customers standing at the counter. Offline transaction queuing — processing card payments in offline mode, storing them securely, and syncing the moment connectivity returns — has to be built into the architecture from the start, not added after the first incident.

05 features

Fast product and menu lookup by name or barcode
Modifier, variant, and add-on selection
Discount, coupon, and loyalty redemption
Split payment and multi-tender checkout
Refund and void with manager approval controls

Core checkout, payment processing, and basic inventory for one location with one terminal type. These typically fall in the mid five-figure range and take ten to sixteen weeks to build.

Multi-register, multi-location POS with full inventory management, kitchen display integration, and accounting sync. These sit in the high five-figure range with a sixteen to twenty-four week build.

Large retail or hospitality groups with franchise support, complex reporting, loyalty integration, and multi-hardware configuration. These run into the six-figure range and are scoped individually.

These are market ranges, not fixed quotes. We give you an itemized number after a short discovery call.

01Discovery

We map your transaction workflow, your hardware environment, your inventory system, and your offline requirements before any design decisions are made.

02Design

We prototype the checkout interface and test it with actual cashiers and operators before development starts so speed and flow problems are found before they are built.

03Development

We build in sprints with regular check-ins so your operations team can review real checkout flows and offline behaviour throughout the build rather than at final delivery.

04Testing

Every build is tested with real hardware in offline and online modes before release so payment processing, inventory sync, and offline queue behaviour are validated first.

We build POS apps natively in Swift for iOS or Kotlin for Android where hardware integration requires it, and in React Native for cross-platform where the hardware supports it. Payments integrate through Stripe Terminal or Square hardware SDKs, keeping card data off the application. The backend runs on Node.js with PostgreSQL for transaction records and inventory. Offline queuing uses local device storage with encrypted transaction holding and automatic sync on reconnection.

Swift
Kotlin
React Native
TypeScript
JavaScript
Node.js
PostgreSQL
Redis
GraphQL
Stripe Terminal
AWS
Firebase

01

Hardware Integration Tested Before Rollout

02

Offline Transaction Queuing From Day One

03

PCI Compliance Scope Minimised By Design

04

Support Through Every Hardware and Payment Change

A POS that slows checkout, fails offline, or goes down during a hardware update is not a technology problem — it is a revenue problem. We build for the failure modes first because that is what operators experience and remember.

A POS that slows checkout, fails offline, or goes down during a hardware update is not a technology problem — it is a revenue problem. We build for the failure modes first because that is what operators experience and remember.

A POS that slows checkout, fails offline, or goes down during a hardware update is not a technology problem — it is a revenue problem. We build for the failure modes first because that is what operators experience and remember.

A POS that slows checkout, fails offline, or goes down during a hardware update is not a technology problem — it is a revenue problem. We build for the failure modes first because that is what operators experience and remember.

01

Hardware Integration Tested Before Rollout

02

Offline Transaction Queuing From Day One

03

PCI Compliance Scope Minimised By Design

04

Support Through Every Hardware and Payment Change

Yes, and we design for offline operation from the start rather than adding it later. Transactions are processed and held in encrypted local storage, inventory is updated locally, and everything syncs automatically the moment connectivity returns. No transaction is lost and no sale requires staff to apologise at the counter.

POS
App Development

Why The POS App Market Needs The Right App