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intermediate
Enterprise team collaboration

Slack Real-Time Collaboration

Slack

Slack powers real-time communication for millions of teams with persistent channels, threaded conversations, file sharing, and a rich app integration ecosystem. The architecture uses WebSocket connections via API Gateway for real-time message delivery, ECS for stateless microservices, and OpenSearch for full-text message indexing. Well-suited for teams building enterprise collaboration tools with channels, threads, and real-time presence indicators.

Data Flow

WebSocket Gateway
Connection Service
Channel Service
Message Service
Notification Handler
File Storage
Workspace DB
Presence Cache
Message Search

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Service Breakdown (9 services)

Compute4 services
Connection Service
  • •Runs containerized microservices at scale
  • •Auto-scales based on CPU and memory utilization
  • •Supports rolling deployments and health checks
Channel Service
  • •Runs containerized microservices at scale
  • •Auto-scales based on CPU and memory utilization
  • •Supports rolling deployments and health checks
Message Service
  • •Runs containerized microservices at scale
  • •Auto-scales based on CPU and memory utilization
  • •Supports rolling deployments and health checks
Notification Handler
  • •Executes serverless functions on demand
  • •Scales automatically with zero idle cost
  • •Ideal for event-driven and async workflows
Storage1 service
File Storage
  • •Stores objects with eleven 9s of durability
  • •Supports lifecycle policies for cost optimization
  • •Serves as a data lake foundation
Networking1 service
WebSocket Gateway
  • •Routes and throttles incoming API requests
  • •Enforces authentication and rate limiting
  • •Provides a unified entry point for microservices
Data3 services
Workspace DB
  • •Manages relational databases with automated backups
  • •Supports Multi-AZ for high availability
  • •Handles read replicas for scaling reads
Presence Cache
  • •Caches hot data in-memory for sub-ms latency
  • •Supports Redis and Memcached engines
  • •Reduces database load with intelligent caching
Message Search
  • •Powers full-text search and log analytics
  • •Scales horizontally for large datasets
  • •Supports real-time indexing and querying

Scaling Strategy

API Gateway WebSocket APIs handle millions of concurrent connections with built-in scaling. ECS auto-scales Channel and Message services independently. RDS stores message history with read replicas per workspace tier. OpenSearch indexes messages asynchronously via SQS to keep delivery latency low. File uploads go directly to S3 with pre-signed URLs.

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