A complete invoice and payment portal built around a real business.

Liberty UAV needed more than a generic checkout link. The business needed one dependable place to create and track invoices, manage customers, collect online and manual payments, follow overdue balances, email billing documents, and keep expense records connected to the work.

I designed and built the entire platform from the ground up. The responsive interface uses custom HTML, CSS, and JavaScript, while Vercel serverless routes handle the private business logic. Customer, invoice, payment, and expense records are stored in a Postgres database. The admin area is protected by signed, HttpOnly session authentication. Stripe Checkout handles online payments and verified payment events update the matching invoice automatically; Resend delivers invoices, reminders, and customer statements from the server. I also built invoice aging filters, automatic balance and fee calculations, manual payment tracking, bookkeeping tools, customer management, printable invoice and statement views, and spreadsheet import/export workflows.

The first working build began on April 20, 2026, and the portal reached production on April 30—10 calendar days from idea to live product. The result is a working business system, not a mockup. Customers can look up an invoice and pay securely, while Liberty UAV can run the full billing workflow from a branded dashboard. It demonstrates my ability to turn an operational need into a designed, database-backed product with secure access, third-party integrations, and real day-to-day utility.