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Billing & inventory

DiamX — Billing Management Platform

  • EJS
  • Node.js
  • Express
  • MongoDB
  • Razorpay
  • REST APIs

Overview

Billing and inventory platform with GST, multi-currency invoices, stock sync, Razorpay payments, PDF invoices and Excel reports.

Challenge / Scope

Billing and inventory had to stay in step: every purchase and sale affects stock, every invoice needs correct GST, transactions can be in multiple currencies, and the business needs printable invoices and exportable reports.

Key features

  • Invoices
  • Purchases
  • Sales
  • Inventory
  • GST calculations
  • Payments
  • Multi-currency transactions
  • PDF invoice generation
  • Excel reports

Architecture / Workflow

  1. ClientEJS admin interface
  2. APIExpress REST API
  3. LogicInvoicing · GST · stock · currency
  4. DataMongoDB
  5. IntegrationsRazorpayPDFExcel

Representative workflow

  1. 1Purchase / sale entry
  2. 2Stock updated
  3. 3GST calculated
  4. 4Invoice generated (PDF)
  5. 5Payment via Razorpay
  6. 6Excel reports

Results

  • Kept invoices, purchases, sales, and stock in one GST-aware flow.
  • Generated PDF invoices and Excel reports for finance ops.
  • Supported multi-currency billing with Razorpay payments.

Engineering highlights

  • 01GST calculations applied across invoices, purchases and sales.
  • 02Multi-currency transaction support within the billing flow.
  • 03PDF invoice generation and Excel report exports.
  • 04Inventory kept in sync with purchase and sales records.

Visuals on this page are illustrative representations of the type of system, not screenshots of the original product.