ERP Portal Node-React Development

I have an existing ERP portal that already runs on a Node.js back end with a React.js front end. I now want to expand and polish three specific areas: • Sales, customers, and invoices • Stock, purchases,... (Budget: ₹12500 - ₹37500 INR, Jobs: AngularJS, Database Management, Git, JavaScript, Node.js, NoSQL Couch & Mongo, React.js, RESTful API)