MediumExperience level: 3-5 years · 8-15 years1 min read

SQS vs SNS vs EventBridge — which messaging service for which job?

Reviewed by Gurusankar M.

Asked inAmazonMicrosoftDeloitte
#sqs#sns#eventbridge#messaging#pub-sub#decoupling
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Short Answer

SQS = a queue (one consumer group pulls, decouples + buffers work). SNS = pub/sub fan-out (push one message to many subscribers). EventBridge = event bus with content-based routing rules, schema registry, and SaaS/AWS event integrations. Pattern: SNS/EventBridge fan-out → SQS per consumer.

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Concept Made Simple

Coffee Chat Question

“SQS vs SNS vs EventBridge — which messaging service for which job?”

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Mind Map Answer

SQS
queue, pull, decouple + buffer
SNS
pub/sub fan-out, push to many
EventBridge
event bus + routing rules + schemas
Combo
SNS/EB fan-out → SQS per consumer

Think Beyond the Expected

What If?

Why is the 'SNS → SQS' fan-out pattern so common?

SNS pushes each event to multiple subscribers, but push delivery can drop if a consumer is down. Subscribing an SQS queue per consumer buffers events durably so each consumer processes at its own pace with retries/DLQ — combining fan-out with reliable, decoupled consumption.

Real World

SNS→SQS fan-out and EventBridge routing are the backbone of event-driven AWS; picking SQS vs SNS vs EventBridge by fan-out/routing/buffering needs is a routine design decision.

Interviewer's Expectation

Keywords they're listening for:

  • SQS queue/pull
  • SNS pub-sub push
  • EventBridge routing/schema
  • SNS→SQS fan-out
  • buffering + DLQ

Common Mistakes

  • SNS-only fan-out without SQS buffering
  • Using SQS where you need fan-out
  • Ignoring FIFO/ordering needs

Best Practices

  • SNS/EventBridge fan-out → SQS per consumer
  • Add DLQs for poison messages
  • EventBridge for content-based routing

Follow-up Questions

  1. SQS standard vs FIFO?
  2. When EventBridge over SNS?
  3. How does a DLQ fit in?

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Plain-language foundations

I'm preparing for a software engineering interview and want to understand this from scratch, as a beginner.

Topic: Lambda (AWS)
Interview question: "SQS vs SNS vs EventBridge — which messaging service for which job?"

Please:
1. Explain the core idea in simple, plain language, using an everyday analogy.
2. Define any technical terms you use.
3. Walk through one small, concrete example.
4. Finish with a single sentence I can easily remember.

Keep the tone friendly and assume I'm new to this topic.
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