DentaPlus

DentaPlus needed a B2B e-commerce solution for dental clinics, hospitals, and high-volume buyers in Australia. The platform required business-specific features: credit-account application/approval, dynamic tiered pricing, multi-variant products, automated PDF invoicing, statements, QuickBooks syncing, and custom fulfillment workflows.

I designed and built the entire system end-to-end: a NestJS API server, a customer storefront with Jotai state management in Next.js 16, and an internal admin dashboard with Zustand and TanStack Query in Next.js 16.

• Architected a NestJS REST API with a PostgreSQL database on Neon via Prisma, utilizing a modular, domain-driven structure (auth, cart, orders, checkout, credit accounts).
• Designed and built a QuickBooks Online sync engine featuring OAuth2 authentication, automated order-to-invoice pushes, and an asynchronous, HMAC-signature-verified webhook listener that updates products, customers, and inventory levels in the local database upon QuickBooks events.
• Implemented a complete B2B credit-based payment workflow, including a credit application form on the storefront, admin approval/rejection panel, automated credit account number (dentaplusId) generation, and 0/30/60/90/120+ days aging balance tracking.
• Configured a nightly scheduler using NestJS Schedule to dynamically recalculate customer aging balances from unpaid invoices and generate monthly PDF account statements.
• Integrated the eWAY Rapid API to process secure credit card payments, tokenizing customers to save payment methods securely (SavedPaymentMethod) for subsequent charges.
• Engineered a guest cart session merging strategy using an X-Session-ID header, automatically merging guest cart items with the customer's database cart upon login.
• Developed a WooCommerce import CLI that parsed legacy CSV data to migrate 1,508 products, 4,906 orders, and 1,011 users into the new PostgreSQL schema.
• Created a bulk pricing evaluation engine that dynamically computes tiered volume discounts server-side on cart updates.
• Built custom PDF generation using PDFKit on-demand for invoices, credit notes, and account statements, uploading them automatically to AWS S3 storage.
• Built the client storefront using Next.js 16, using Jotai for auth and cart state persistence (localStorage dp.auth / dp.sessionId), Tailwind CSS v4, and shadcn/ui components.
• Developed the admin dashboard in Next.js 16 with Zustand auth, TanStack Query for caching and data fetching, and Axios interceptors for auth tokens.