SNS Fanout to SQS and Lambda — Pub/Sub Message Routing

Build a complete pub/sub messaging architecture on AWS using SNS, SQS, and Lambda. You will create an SNS topic with multiple subscribers, deploy a Lambda consumer, implement message filtering with subscription filter policies, and configure a dead-letter queue for failed message handling.

You'll learn to:

• Create an SNS topic and subscribe SQS queues with proper access policies
• Deploy a Lambda function as an SNS subscriber
• Publish messages and verify fanout delivery to all subscribers
• Apply subscription filter policies for attribute-based message routing
• Configure a dead-letter queue with a redrive policy on SQS
• Simulate message processing failures and observe DLQ behavior

Key Resources:

• SNS Fanout to SQS
• SNS Message Filtering
• SQS Dead-Letter Queues