Node.js Realtime API Development

I’m building a standalone API and have settled on Node.js for the backend. The service must handle user authentication, persistent data storage, and real-time updates from the outset, so I need someone who is comfortable weaving all three together without bolting them on as after-thoughts... (Budget: ₹1500 - ₹12500 INR, Jobs: API Development, Docker, Express JS, JavaScript, Node.js, PostgreSQL)