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Invoice Management SaaS (Xero-inspired)

A multi-tenant invoicing SaaS inspired by Xero. Users can create invoices, manage contacts, generate invoices from templates, preview PDFs, and control editing via Draft/Sent/Paid states with clean, reusable UI components.

Invoice Management SaaS (Xero-inspired) cover

Project Brief

A production-grade invoicing SaaS inspired by Xero, built with React/Next.js and TypeScript. The app focuses on clean component architecture, strict typing, and state-driven permissions across the invoice lifecycle (Draft/Sent/Paid). It supports invoice generation with customizable templates and live preview, and integrates with Supabase for authentication and data storage.

Repositories

Approach

  • Planning & Product Goals
    • Designed an MVP around real invoicing workflows: dashboard → invoice view → create/edit → send → read-only states
    • Prioritized low-click UX, predictable UI behavior, and clear permission boundaries over unnecessary complexity
    • Defined invoice lifecycle states (Draft / Sent / Paid) as the source of truth for UI editing rules
  • Frontend Architecture
    • Built a component-driven UI with reusable building blocks (invoice header, line items, totals, status actions)
    • Implemented strict TypeScript types across invoices, contacts, items, and totals to reduce runtime edge cases
    • Used design-system patterns for consistent spacing, typography, and form controls
  • Invoice Generation & Templates
    • Implemented invoice generation using template-based layouts with a clear separation between editable form state and rendered output
    • Added custom template support (branding, layout variations) to allow different invoice styles per organization
    • Built an invoice preview flow so users can review the final output before sending or exporting
  • Backend & Data Model
    • Integrated Supabase authentication and multi-tenant data access patterns
    • Modeled core entities: contacts, invoices, invoice_lines, templates/branding, and status transitions
    • Implemented API integration with robust loading, error, and empty-state handling in the UI
  • Quality & Deployment
    • Validated key workflows end-to-end (create invoice, edit draft, lock sent invoices, template preview, status changes)
    • Kept changes reviewable by following existing patterns and avoiding inline hacks

Features

  • Invoice lifecycle states: Draft / Sent / Paid with edit-permission boundaries
  • Invoice generation with customizable templates and branding
  • Invoice preview before export/send
  • Reusable UI components (header, line items, totals, actions)
  • Contact management and invoice creation workflows
  • API integration with clean async state (loading/error/empty states)
  • Multi-tenant authentication and secure data separation (Supabase)
  • Responsive UI with a consistent design system approach

Tools & Technologies

ReactNext.jsTypeScriptMUITailwind CSSSupabasePostgreSQLGitGitHubNetlify