Design a Slack-Like Messaging Platform
Company: Crusoe
Role: Software Engineer
Category: System Design
Difficulty: easy
Interview Round: Onsite
Design a Slack-like messaging platform that supports direct messages, group chats, and file sharing.
Your design should cover:
- One-to-one direct messages.
- Group chats with many members.
- Sending, receiving, editing, and deleting messages.
- Real-time message delivery to online users.
- Offline delivery and push notifications.
- File upload, download, preview, and sharing inside conversations.
- Message history retrieval and pagination.
- Basic reliability, scalability, and data consistency considerations.
Assume the system serves millions of daily active users and needs low-latency message delivery across multiple regions.
Quick Answer: This question evaluates expertise in designing real-time distributed messaging systems, covering competencies such as low-latency message delivery, data consistency, fault tolerance, scalability, offline delivery and push notifications, and file storage/serving within conversation contexts.