Building a Scalable Messaging API with AWS End User Messaging and SES
Messaging & Targeting Blog
This article provides a guide for building a scalable, multi-channel messaging API using AWS serverless services with email and SMS capabilities.
- Decoupled architecture using API Gateway, SQS, Lambda, SES, and AWS End User Messaging
- JWT authentication via Lambda Authorizer with secrets stored in AWS Secrets Manager
- Automatic retries up to three times; failed messages move to Dead Letter Queue
- DynamoDB template management for reusable email and SMS message templates
- Configuration Sets for delivery tracking, cost monitoring, and event routing
- CloudWatch alarms alert when messages fail and move to DLQ
- Deployed via AWS SAM with complete infrastructure-as-code templates
- Estimated cost: ~$106/month for 1M messages (SES dominates at $100)
- Security best practices: HTTPS, IAM least privilege, encrypted secrets, token caching
The solution provides production-ready multi-channel messaging with resilience, scalability, and comprehensive monitoring through serverless AWS services.
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