Can you build a system like TradeSync (Offline-First POS & Inventory Engine) for my business?

Yes. TradeSync (Offline-First POS & Inventory Engine) is an example of the kind of system I build for Nigerian service businesses. Book a free consultation at demoladevop.com/booking and we can map out exactly what your business needs.

How long does it take to build a system like this?

Most systems take between 2 and 6 weeks depending on complexity. A straightforward booking or invoicing system typically takes 2–3 weeks. A full custom dashboard or multi-platform integration takes 4–6 weeks.

How much does this kind of system cost?

Every project is scoped individually because no two businesses have the same workflow. Book a free 30-minute call at demoladevop.com/booking to discuss your specific situation and get a clear estimate.

What happens if something breaks after you build it?

Every system I build comes with a handover session so you understand how it works. For ongoing support and maintenance, we can discuss a monthly retainer arrangement during the consultation.

Projects/TradeSync

WORKFLOW

Built For:

Retail / E-commerceFMCG Distributor

TradeSync

Offline-First POS & Inventory Engine

Overview

Nigerian retail and distributor businesses struggled when power cuts or internet outages dropped their sales systems offline, forcing them back to paper records. This system is an offline-first POS and inventory engine that keeps running without an internet connection and syncs automatically when back online. It completely eliminates manual reconciliation by tracking cash drawers, staff payroll, and complex credit sales in one resilient dashboard.

System Highlights

✦A Lagos supermarket halts sales when the internet drops. This POS keeps scanning barcodes and printing thermal receipts offline, requiring zero technical skill from cashiers.
✦The hardest part of this build was not the inventory math. It was ensuring the offline queue syncs flawlessly to the cloud without dropping a single Naira when the network returns.
✦Nigerian retail owners spend every Sunday matching paper receipts to stock. This system mathematically locks daily cash drawers and automates staff payroll without adding admin headcount.
✦Customer debt and staff loans destroy small businesses. The system manages credit sales, split payments, and shift payroll natively alongside standard inventory.

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The Core Problem

Whenever the internet went down, cashiers reverted to writing sales in a notebook, causing massive inventory blind spots. Owners spent every Sunday matching manual paper receipts against physical stock. Staff loans and customer debt were tracked in scattered WhatsApp messages. This pure manual grind destroyed the owner's weekend and led to untraceable missing stock and missing cash at the end of shifts.

Infrastructure & Reliability

Lagos businesses face unreliable internet. This POS runs fully offline using local storage, allowing cashiers to keep scanning barcodes and printing thermal receipts locally during a network outage. When the connection returns, the system automatically syncs the local drawer queue with the cloud database. The data architecture is strictly compliant with the Nigeria Data Protection Act (NDPA) 2023. This ensures sensitive customer debt records and supplier data stay secure, even across local device failures, without staff needing any technical workarounds.

My Approach

The system prevents the business from ever pausing. The web application runs local-first in the browser, treating the cloud as a secondary sync layer. This avoids forcing a cloud-only approach. Every action, from opening a daily shift to accepting split payments or recording supplier debt, is designed for speed and offline reliability. Automated PDF receipt generation and real-time barcode scanning are integrated directly into the browser. Owners do not need expensive proprietary hardware. Standard phones and local thermal printers are enough.

System Capabilities & Impact

The system caches and processes over 1,000 sales locally during total network failure. It syncs instantly upon reconnection. It mathematically eliminates end-of-day cash disputes. The system forces explicit 'Cash Drawer Movements' for every Naira paid in or out during a shift. It automates payroll calculation dynamically based on cashier commissions. This reduces admin headcount overhead.

Project Gallery

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What Powers This System

The infrastructure keeping this system fast, secure, and always on

Next.jsNestJSPrisma ORMPostgreSQLDexie (IndexedDB)Serwist (PWA)BetterAuthhtml5-qrcodepdf-lib

Need this deployed in your business?

We install the exact engine, integrate your payments, and train your staff in 3 days. Zero technical skills required.