Event-driven Systems — Complete Guide
Event-driven Systems — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of AWS Cloud Tutorial on Toolliyo Academy.
On this page
AWS Cloud Tutorial · Lesson 58 of 100
Event-driven Systems
Core services ✓ → Projects
Projects · 2 — Deploy · ~10 min · AWS — Serverless & Event-Driven
What is this?
Event-driven systems react to facts (events) instead of polling. Producers emit; consumers process asynchronously with loose coupling.
Why should you care?
AwsVerse e-commerce emits OrderShipped so inventory, CRM, and analytics update independently.
See it live — copy this example
Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).
aws events put-events \
--entries '[{"Source":"awsverse.orders","DetailType":"OrderShipped","Detail":"{\"orderId\":\"ORD-551\",\"trackingId\":\"TRK-99\"}","EventBusName":"awsverse-bus"}]'What happened?
- Publishes a custom OrderShipped event to a dedicated bus.
- Subscribed Lambdas and SQS queues react without the order service knowing them.
Practice next
- Define event catalog with detail-type names.
- Publish events from domain services only.
- Consumers subscribe via EventBridge rules.
- Add schema to EventBridge Schema Registry.
- Replay archived events to new consumer.
Remember
Events decouple domains. EventBridge central router. Design for at-least-once delivery.
AwsVerse order ripple
New analytics service needs order history.
Outcome: Subscribe to existing bus — no changes to order API.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
