Backend Integration for NexusERP

I have a fully working single-page ERP/POS application (NexusERP v2) that currently runs 100 % on the browser and stores everything in localStorage. The front-end code is clean ES6 modules with modern CSS, so your focus will be the server side: designing and wiring up a real database layer.

My only requirement right now is database integration. I’ve decided on a SQL engine—specifically SQLServer—so the job centres on modelling the data, creating the schema, and exposing the necessary endpoints my front-end can call (REST or GraphQL: I’m open, as long as the calls stay lightweight).

Key points you’ll handle
• Translate the existing entity structure (products, clients, inventory, sales, etc.) from localStorage to SQLServer tables with proper relationships and indexes.
• Seed the database with a converter script so current demo data keeps working.
• Build a thin back-end that returns JSON my SPA can already consume. I don’t need a full auth layer yet—just clean, well-documented routes.
• Make sure the SPA still feels instant; caching and pagination strategies are welcome.
• Deliver scripts and concise README so I can spin the whole thing up with one command on Windows-based hosting or Docker.

If you have recent experience with SQLServer, Node.js (or another lightweight runtime you can justify), and SPA integrations, let’s talk. Clean code, clear naming, and commented migrations will be the acceptance criteria.