Designs II: real-time and collaboration
Design apps where many clients change shared state.
Practice rooms
- Design: chat / messaging appwhiteboard + follow-ups
- Design: collaborative document editorwhiteboard + follow-ups
- Design: notifications system (in-app + push)whiteboard + follow-ups
- Design: project management / kanban toolwhiteboard + follow-ups
- Design: video conferencing UIwhiteboard + follow-ups
- Design: collaborative whiteboard / canvaswhiteboard + follow-ups
Interview questions in this module
- Design a chat application frontend. How do you handle offline messages and ordering?
- Design a collaborative editor like a shared document. How do you resolve concurrent edits?
- Design an in-app notification system with unread counts across tabs.
- Design a kanban tool used by many people at once.
- Design the client of a video-calling app.
- How do you show presence and typing indicators without flooding the server?
- What happens when a chat user is offline for a week?
- How do you keep notification counts correct across devices?
- How do you test real-time features?