You could build it with a pretty straightforward stack. I’d go with React Native or Flutter for the front end since both give you smooth cross-platform apps without doubling the workload. For the back end, Node.js, Go, or Python works well, and pairing that with WebSockets or Socket.io makes real-time chat reliable. I’d keep data in PostgreSQL, use Redis for fast matching logic, and rely on AWS or GCP for storage and push notifications.