InvoiceFlow

The Problem

For freelancers, consultants, and small businesses, invoicing is one of those 'must-do' tasks that often becomes painful.

Invoices are made in Word/Excel templates that break formatting, calculations are manual and error-prone, client details are scattered across emails and notes, exporting a clean, print-ready PDF takes extra effort, and tracking invoice status (draft/sent/paid/overdue) becomes messy fast.

• Invoices are made in Word/Excel templates that break formatting
• Calculations are manual and error-prone
• Client details are scattered across emails and notes
• Exporting a clean, print-ready PDF takes extra effort
• Tracking invoice status (draft/sent/paid/overdue) becomes messy fast
• No centralized system to manage invoices and customers

The Vision

InvoiceFlow was designed as a complete invoice management system, not just an invoice generator. The goals were to make invoice creation feel instant, give users a live preview as they edit, save customers and invoices in one secure place, produce high-quality PDFs with one click, and support real-world needs like currencies, taxes, templates, watermarks, and signatures.

What InvoiceFlow Does

InvoiceFlow helps users create professional invoices using a guided, multi-step builder, save and reuse customer/client information, track invoice statuses like draft, sent, paid, overdue, view revenue and performance through dashboard analytics, export print-ready invoices as high-quality A4 PDFs, customize invoices with templates, branding, signatures, and watermarks, and use multi-currency support for international clients.

It's built to work like a real product—not a one-page demo.

• Create professional invoices using a guided, multi-step builder
• Save and reuse customer/client information
• Track invoice statuses like draft, sent, paid, overdue
• View revenue and performance through dashboard analytics
• Export print-ready invoices as high-quality A4 PDFs
• Customize invoices with templates, branding, signatures, and watermarks
• Use multi-currency support for international clients

The 'Real User' Experience

InvoiceFlow provides a complete invoicing workflow that feels natural and professional.

• Login & Personal Workspace: Users sign in securely and instantly get their own private workspace. Their invoices and customers are isolated to their account.
• Create an Invoice in Minutes: The invoice creation flow is streamlined with company info (auto-filled from profile), client info (select from saved customers or type manually), line items with automatic totals and tax calculation, notes/payment terms, and choose a professional template. The best part: the invoice preview updates live while typing.
• Export to PDF with One Click: When the user clicks 'Download PDF,' InvoiceFlow generates a clean A4 PDF that's ready to send or print—no formatting headaches.
• Track Everything: Invoices don't just get created—they get managed with a searchable list, filters, status updates, and an analytics dashboard for totals and revenue.

Key Features That Make It Stand Out

InvoiceFlow includes features designed to make invoicing effortless and professional.

• Live Preview Invoice Builder: Users see exactly how the invoice will look as they edit—reducing mistakes and making customization feel effortless.
• Customer Management (Built In): Instead of retyping details every time, users store customers once and reuse them with quick selection and auto-fill.
• Templates + Branding: Users can choose from Modern, Classic, and Minimal templates, plus branding options like company logo, signatures, customizable watermark ('DRAFT', etc.), and payment notes / bank details.
• Multi-Currency Support (11+): Designed for real-world invoicing with international clients (including PKR support).
• PDF Export That Looks Professional: High-quality PDF generation optimized for A4 sizing, scaling, and print-ready formatting.
• Dashboard & Analytics: Users can quickly track total invoices, total revenue, paid vs unpaid, monthly stats, and recent invoice activity.

How It Works (Simple + Technical Balance)

InvoiceFlow is built on a modern full-stack approach that balances simplicity with powerful functionality.

• The UI is built in Next.js + React, making the app fast and responsive
• Backend logic runs through Next.js API routes, keeping everything in one codebase
• Authentication is handled by Clerk, giving secure sessions and user isolation
• Data is stored in PostgreSQL via Supabase, designed for scalability
• PDF export uses html2canvas + jsPDF to generate high-quality downloads from the invoice preview
• Every user action is validated, saved, and reflected in the UI with clear feedback

My Role

I built InvoiceFlow end-to-end, including product design, invoice creation and preview logic, customer management, secure API routes, database schema design, PDF export implementation, status tracking and analytics, and mobile responsiveness.

• Designing the product experience (flows, usability, dashboard structure)
• Building invoice creation and preview logic
• Implementing customer management and reusable profile settings
• Building secure API routes with authentication checks
• Designing the database schema and indexes
• Implementing PDF export with scaling and layout stability
• Adding status tracking + analytics for real business value
• Ensuring mobile responsiveness and polished UI

Why This Project Matters

InvoiceFlow shows more than 'I can build CRUD.' It demonstrates product thinking (UX-first, real workflows), polished UI and design systems, scalable architecture (auth + db + API routes), professional document generation (PDF export done right), and multi-tenant security patterns (user_id isolation).

This is the type of app that can evolve into a full SaaS product.