Built My First Backend-Heavy System – Need Feedback

I’m a student web developer and this is my first full backend + full-stack system.

Previously I only built small frontend projects. Over the past 2 months, I built a complete private single user POS and inventory management system for a brand using Node.js, Express, and MongoDB.

This is my first serious full-stack build, and I would really appreciate feedback from experienced developers on architecture, structure, and overall system design.

Since this is a private internal admin panel, I cannot share public access, but here’s what it includes:

Core Features

1. Product & Inventory Management

   • Full Product CRUD
   • Centralized product listing page
   • Automated barcode generation for all products using bwip
   • Dedicated page per product with editable fields
   • Inventory tracking tied to orders

2. POS & Billing System

   • Complete order creation flow
   • Barcode scanner logic setup
   • GST calculation logic
   • Invoice generation using Puppeteer
   • Automatic invoice storage on Google Drive
   • Invoice link sent to customers via WhatsApp API

3. Order Management

   • Centralized order list
   • Dedicated page per order
   • Immutable financial records
   • Order status & payment status lifecycle control

4. Authorisation

   • Session and cookie based

5. Query Databse

   • Searchbar Keyword based query system using a specefic [keyword-value] language I created

Since this is my first serious backend project, I’m especially

looking for feedback on:

• Architecture decisions
• Data modeling
• Acceptability with Production standards
• Scalability concerns
• UI/UX Flow

Feel free to question me on any whatever aspect you feel uncertain about

Here are some Images of the Website -