Design a Chat Application — Roadmap Step & Resources
Real-time one-to-one and group messaging, delivery guarantees and presence
- Level: advanced
- Estimated time: 2 days
- Roadmap: System Design
Before this step
Mini projects
- Whiteboard a full design for a WhatsApp-style chat system
Interview questions
- How would you guarantee message ordering and delivery in a chat app?
Study resources
- System Design: WhatsApp / Chat Application (Video) — A practical, whiteboard-style walkthrough of designing a real-time chat system.
- Design a Chat System (Article) — The System Design Primer includes a dedicated worked solution for a chat service.
Part of
- System Design Interview Practice & Case Studies — section
- System Design roadmap — the full learning path