FBR Digital Invoice App
Government-Compliant Tax Invoicing Desktop Software (Pakistan)
A native desktop app that lets Pakistani businesses submit FBR-compliant sales invoices offline-first — correct tax math, a validate-then-post gateway handshake, QR codes and print-ready PDFs. Migrated from Electron to Rust/Tauri, cutting the install from ~300 MB to ~12 MB with an identical UI.
Tauri v2 (Rust)React 18
TypeScript
Tailwind CSSCase Study
Swipe through the full walkthrough — click any slide to enlarge
Engineering Highlights
Fully offline — all data (auth, settings, invoices, templates) lives in a local AES-256-GCM encrypted SQLite database.
Validate-then-post FBR gateway handshake with exact tax math snapshotted per invoice so historical records never drift.
Compliant output: 96×96 FBR-spec QR codes and print-ready A4 PDF export.
Electron → Rust/Tauri migration with zero UI rewrite — ~96% smaller install, native performance.
Secrets bound to the machine via Windows Credential Manager, behind a hidden vendor/admin gate.
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