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Lessons (11)

• Design a Social Media Feed

  Build a fast home feed with fan-out choices, durable post storage, eventual consistency and safeguards for celebrity …

• Design a Chat Application

  Deliver live messages without losing them by separating durable messages from fan-out, presence and offline notifications. The …

• The Hot SKU Alert Problem

  … PriceChanged(product, version, old, new) ↓ outbox publisher ↓ Kafka ↓ fan-out and delivery pipeline The outbox makes the database …

• Go Concurrency: Goroutines, Channels and Context

  … and fan-out / fan-in A pipeline is a chain of stages connected by channels. Fan-out runs …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  Build resilient serverless workflows with retries, dead-letter queues, idempotency, fan-out and orchestration. Messages are delivered at …

• AWS Messaging: Queues, Topics and Events

  Use SQS to hold work, SNS to fan out notifications, and EventBridge to route events without tightly coupling …

• Backend Design Scenarios

  … For ordinary users, fan-out on write : when someone posts, enqueue jobs that place the post ID into …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … direct, topic, fanout, headers exchanges Simple: topic + partition by key Ordering Per queue (with one consumer) Per partition …

• Message Queues & RabbitMQ

  … takes messages out and does the work. ![A message queue decouples the producer from the consumer](/img/backend …

• Collaborative Document Editing & Real-Time Sync

  … Use tiered fan-out : the sequencer publishes to a few relay nodes , and each relay serves thousands of …

• Proxies, APIs and Real-Time Protocols

  … connections Live two-way chat WebSocket Connection lifecycle/fan-out Ordered reliable bytes TCP More overhead Loss-tolerant …