Retail shops (apparel, cosmetics, grocery) managing dynamic barcode catalogs.
POS & Inventory Automation — Offline-First Retail Power
Stop relying on paper registers or slow cloud portals that lock up when the internet drops. We build custom, offline-first web POS systems synced with Supabase.
Ideal Scopes
Who This Is Engineered For
Mobile phone dealers requiring IMEI serialization logs and customer installment tracking.
Wholesale distributors logging daily credit balances and vendor ledger accounts.
Deployment Deliverables
What You Get in the Base Setup
A comprehensive list of fully configured nodes, layouts, and pipelines included in our custom system builds.
- Offline-capable web POS interface supporting physical barcode scanners.
- Dynamic inventory sync dashboard showcasing real-time store metrics.
- Customer credit (khata) ledger logs tracking partial payments.
- Automated daily, weekly, and monthly net profit calculation grids.
- Complete source code, database scripts, and 30 days of maintenance support.
Integrations
Connected to Your Existing Stack
We configure safe, secure webhooks, vector connections, and client databases directly interacting with the products you already rely on.
Supabase / PostgreSQL n8n Webhooks SQLite / Local Caching WhatsApp Business API Tailwind UI Components
System Checkout
Expected Delivery
14-25 Days
Starting Quote
$1,500
✓ Custom n8n workflow pipelines included.
✓ Full client-side data configuration & Supabase hook setup.
✓ Hand-off instruction session & 30 days post-launch support.
Implementation breakdown
Deep Dive & Technical Breakdown
Paper register books are slow, prone to accounting errors, and impossible to audit. Yet, cloud-only SaaS POS portals fail in regions with unstable internet connections or frequent load shedding. Deploying a custom pos inventory system supabase offline first setup gives your retail business sub-second checkout speeds and absolute database reliability, offline or online.
🛑 Critical Pain Points in Retail Operations
If your retail team is still using paper ledgers or basic registers, you face daily leakage:
- Slow Checkout Queues: Manually searching for items or typing pricing variables leads to long customer wait times.
- Credit Tracking Chaos: Customer credits (khata) written on loose pages are easily lost, resulting in uncollected debts.
- Lack of Real-Time Profit Data: Calculating net margins after subtracting wholesale costs manually takes hours of administrative work.
⚙️ Offline-First Synchronization Architecture
Our system uses browser storage to process checkouts instantly and syncs with the cloud:
[Barcode Scanned on Terminal]
│
▼
┌──────────────────────────────────┐
│ 1. Write to Local DB Cache │ (Sub-second checkout in browser)
└────────────────┬─────────────────┘
│
▼
┌──────────────────────────────────┐
│ 2. Network Status Check │
└────────────────┬─────────────────┘
│
┌────────┴────────┐
▼ (Online) ▼ (Offline)
┌────────────────┐ ┌────────────────┐
│ Push Sync │ │ Cache Queue │ (Holds rows in IndexedDB/SQLite)
│ to Supabase │ │ Retries Loop │
└───────┬────────┘ └───────┬────────┘
│ │
▼◄──────────────────────┘
┌──────────────────────────────────┐
│ 3. Update Master Dashboard │ (Inventory updated across branches)
└──────────────────────────────────┘- Local IndexedDB Write: Every barcode scan and cart payment is logged locally on the sales terminal device.
- Network Gate Checks: The application checks connectivity. If connection is active, n8n pushes rows to Supabase; if offline, transactions are queued.
- Master Inventory Update: Once synced, stock counts are updated globally. Link this layout with our E-commerce Inventory Sync to update WhatsApp catalogs.
💎 Core Features Built for Retail Growth
- Local Thermal Print Engine: Sends raw ESC/POS commands directly to local hardware, bypasses print dialog screens.
- ** IMEI & Serial Logging:** Prevents fraud by matching returned mobile boxes to specific client purchases.
- Automated WhatsApp Invoice Receipt: Pings purchase tallies directly to customer chats. Combine this with our WhatsApp Automation setup.
- Khata Balance Tracking: Logs partial cash split histories to track vendor credit risks.
- Unified Branch Analytics: Managers monitor stock, profits, and staff sales counts across all shops in one view.
🤝 Delivery & Pricing
Our offline-first POS systems start at $1,500 for a single-terminal database deployment:
- Days 1-5: Schema & Barcode Mapping: Define stock schemas, configure barcode reader scripts, and set up local IndexedDB structures.
- Days 6-15: Sales Logic & n8n Sync: Build the checkout interface, code tax rules, and engineer offline retry queues.
- Days 16-22: Integration & Testing: Set up thermal printer outputs, test offline transaction queues, and verify branch analytics.
- Days 23-25: Handover: Deploy the master database to Supabase, launch local branch clients, and begin 30 days of active support.
🚀 Book a Free POS System Audit
Ready to transition to an offline-first, custom POS inventory dashboard? Let’s check how we can design a reliable, secure sales workflow for your store.
Service FAQ
Frequently Asked Questions
What does offline-first actually mean for our daily sales?
If your store loses internet connection or electricity cuts out, your POS terminal keeps running normally. You can still scan items, calculate totals, print receipts, and log sales locally. The data caches securely on the device and syncs to Supabase once online.
Can we use standard physical barcode scanners and thermal printers?
Yes. Our web POS modules are optimized to handle raw keyboard input from USB/Bluetooth barcode scanners and integrate with ESC/POS thermal printers for instant receipt printing.
How is client credit (khata) and split payment tracked?
We design dedicated credit ledgers inside Supabase. You can log sales against specific customer profiles with unpaid splits. The dashboard tracks total outstanding credit, records payment history, and auto-calculates total risk.
How do we update catalog items and pricing across multiple branches?
Branch terminals pull pricing schemas from a single Supabase instance. When you update a price or add a barcode in the master dashboard, n8n distributes the update to all branch caches automatically.
Does the POS support IMEI/Serial number logging for electronics?
Yes. For mobile and electronics retailers, we configure serialized tracking. The terminal requires staff to scan or type a unique IMEI/Serial number before confirming the sale, mapping the exact unit to the invoice.
What happens if a device cache is cleared before sync completes?
We implement local file persistence backups. Transactions are written to secure browser application storage and duplicate local files, preventing data loss even if browsers are closed or refreshed.
Can the POS automatically notify customers of bills on WhatsApp?
Yes. We connect WhatsApp APIs. Once a transaction is completed, n8n receives a webhook log, compiles a digital receipt invoice, and pings it directly to the customer's WhatsApp number.
What are the local Pakistani tax (FBR) integration capabilities?
We build custom middleware hooks. If FBR integration is required for your tier, we configure n8n to format the JSON data payloads and query the official FBR POS API during checkout.
Base Investment $1,500