Business OperationsMedium system

Invoicing & Billing System

Create, send, and track branded invoices with payment status, reminders, and recurring billing. For businesses tired of invoicing from Word templates or paying per-user fees for features they don't use.

Typically bought by: Agencies, consultants, trade contractors, clinics, and subscription-style service businesses

Standard features

Always included in the base price. Every one is built, tested and delivered working.

Branded invoice creation with line items, taxes, and discounts
Client database with billing details
Invoice statuses (draft, sent, viewed, paid, overdue)
PDF generation and email delivery
Automatic payment reminders
Recurring invoices for retainers/subscriptions
Partial payments and payment recording
Credit notes and refunds
Revenue and aging (AR) reports
Multi-tax and multi-currency support
Numbering sequences and audit trail
Online payment link on invoices

Popular custom additions

Quoted per feature in the configurator — $50 simple, $150 moderate, $300 complex.

Country-specific e-invoicing/tax authority compliance
Client portal to view and pay invoices
Usage-based or metered billing rules
Integration with time tracking to bill logged hours
Late fee automation
Multi-entity invoicing for groups of companies

Tech stack

Frontend: Next.js + Tailwind CSS
Backend: Next.js API routes / Node.js
Database: PostgreSQL (Neon)
Integrations: Payment gateway (Stripe/PayPal/other), Email service (SendGrid/Resend), Accounting software (QuickBooks/Xero), PDF generation