A full-stack capstone needs to demonstrate the whole chain: frontend UI, a backend API, a database schema, and auth — not just one layer done well. These ideas are picked to stretch all three.
Posts, follows, likes, and a real-time feed — good for showing WebSocket or polling-based updates.
Drag-and-drop boards, team roles, and activity history — a strong system-design talking point for a viva.
Socket.io or WebSocket-based messaging with rooms/DMs and online-presence indicators.
Stock tracking, invoice generation, and low-stock alerts — a practical, demo-friendly domain.
Restaurant, customer, and delivery-partner roles in one system — ambitious but very demoable.
Auth-gated voting with tamper-resistant result aggregation — a good excuse to discuss security decisions.
Catalog search, borrow/return workflows, and overdue tracking — a classic, easy-to-scope full-stack build.
Search, availability calendars, and booking confirmation flow, similar in shape to Airbnb's core loop.