MERN Real-Time Notification Feature

My MERN application already has its core pages and data models in place; what’s missing is a seamless, real-time notification layer that keeps users informed of one another’s activity the moment it happens... (Budget: ₹750 - ₹1250 INR, Jobs: AngularJS, Documentation, Express JS, Frontend Development, JavaScript, MERN, MongoDB, Node.js, React.js)