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Phase 15 · Message Queues & Event-Driven Architecture

Topics

Event-Driven Architecture

Part of the Backend Developer Roadmap.

Summary

Designing a system around services reacting to events (things that happened) rather than direct calls to each other — improving decoupling but adding complexity in tracing and consistency.

How to Learn This

  • 1Redesign a simple feature (order placed → send email → update inventory) as a sequence of events.
  • 2Learn the trade-off: event-driven systems are more decoupled but harder to trace and debug.
  • 3Understand eventual consistency as a consequence of asynchronous, event-driven flows.

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Pub/Sub vs Queue

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Dead Letter Queues

More topics in Message Queues & Event-Driven Architecture

Message Queue ConceptsRabbitMQApache Kafka BasicsBullMQPub/Sub vs QueueDead Letter QueuesIdempotent Consumers
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