Event Live Polling WebApp

I’m organising a single-day society event and I need a lightweight, mobile-friendly web application that lets up to 500 people take part in quick, Tambola-style polls. Guests will scan one shared QR code, type only their name, and immediately see a board of circular buttons numbered 0–100... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, iPhone, Mobile App Development, Node.js, PHP, React.js, Web Application, Web Development)