Build a real business application
Build a secure invoice application with saved customers, multiple items, trusted totals, discounts, tax and professional printing.
This is Workbook 04 in the Prompt to Profit™ Software Workbook Series. It is a complete standalone learning project. You can begin here without owning or completing another workbook in the series.
Who this workbook is for
- Complete beginners who want to build useful software with AI
- Small business owners who want to understand how custom business applications are created
- Students and career changers building practical portfolio projects
- People who prefer clear, guided projects instead of disconnected coding exercises
- Learners using Notepad and a browser rather than a professional development environment
What you will build
- Build a responsive invoice software website and dashboard
- Create secure customers, invoices and invoice_items tables
- Save customer profiles and select customers when invoicing
- Add and remove several invoice items
- Calculate trusted subtotals, discounts, tax and totals
- Save and view complete invoices and customer snapshots
- Search, filter, sort and edit invoices
- Print clean professional A4 invoices
- Confirm and securely delete invoices and their related items
- Test every important workflow and user-ownership rule
What you will learn
- Understand related database tables and cascading records
- Build trusted financial calculations
- Preserve invoice history while editing
- Create professional print layouts
- Deliver a complete invoice application for a software portfolio
Your chapter-by-chapter path
- Building the Public Website
- Connecting to Supabase
- Building the Complete Authentication System
- Building the Invoice Database
- Building the Invoice Dashboard
- Viewing Invoices
- Searching, Filtering and Sorting Invoices
- Editing Invoices
- Printing and Deleting Invoices
- Final Testing and Project Completion
Tools used in the workbook
- HTML for page structure
- CSS for layout, colours and responsive design
- Vanilla JavaScript for application behaviour
- Supabase for authentication, database storage and security
- ChatGPT as your AI software development partner
- Notepad for creating and updating complete files
- A modern browser for testing
You do not need VS Code, Node.js, React or a JavaScript framework.
Designed for careful beginner progress
Every lesson explains what you are building, why it matters, what to prepare, the complete Build Prompt, what AI should return, how to save the files and how to test the completed capability.
The workbook also includes checkpoints, common beginner mistakes, behind-the-scenes explanations, software-design questions and a clear summary of what you learned.
Security is part of the project
You will not build a demonstration that exposes every user's records. The workbook teaches authenticated ownership checks, Supabase Row Level Security and two-account privacy testing so you can verify that one user cannot access another user's information.
Learner support included
- A visual glossary of recurring terms
- Backup instructions before replacing complete files
- A troubleshooting checklist
- A reusable error log
- Code-reading questions after major capabilities
- Final testing and live deployment guidance
- Portfolio description, reflection questions and extension challenges
Workbook details
- Format: Protected digital PDF
- Length: 302 pages
- Difficulty: Beginner
- Estimated completion time: 25–30 hours
- Series: Prompt to Profit™ Software Workbook Series
- Produced by: Tochukwu Tech and AI Academy
Work at your own pace
The estimated time is a guide, not a deadline. Complete the lessons in order, test every important capability and stop to correct problems before moving forward. By the end, you will have both a working application and a clearer understanding of how complete software is planned, built, secured, tested and published.