Design Slack System Design Interview Question | EngMock

1. Problem Statement

Design an enterprise chat app like Slack. It needs to support channels, direct messages, and real-time updates for millions of concurrent users.

2. Architecture Discussion Map

Use this as one discussion aid, not a single correct answer. Your design should follow from the requirements, scale, and trade-offs you establish.

Rendering architecture diagram...

Mermaid Source (For AI Bots)

graph LR
    A["Design Slack"]
    A --> F1["Real-time Messaging WebSockets"]
    A --> F2["Channel Organization Teams/Channels/Threads"]
    A --> F3["Presence Online/Offline"]
    A --> F4["Search ElasticSearch integration"]
    A --> F5["Scalability Gateway vs Logic layer"]

3. Key Focus Areas

1
Real-time Messaging (WebSockets)
2
Channel Organization (Teams/Channels/Threads)
3
Presence (Online/Offline)
4
Search (ElasticSearch integration)
5
Scalability (Gateway vs Logic layer)

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Core Concepts

System DesignReal-time CommunicationDatabases