This Guidance uses services managed by AWS like Amazon SQS , Lambda , API Gateway , EventBridge , Step Functions , and DynamoDB to enhance operational excellence. These services operate at the Regional level, utilizing multiple Availability Zones for high availability and fault tolerance. Built-in error handling and dead-letter queues provide visibility into failures, enabling timely detection and mitigation. The serverless nature of these services simplifies operations and reduces operational overhead.

AWS Identity and Access Management (IAM), Lambda , API Gateway , Amazon SQS , and DynamoDB contribute to a secure architecture. IAM enables granular access control and least-privilege access to resources. API Gateway authorizes inbound API requests, while Amazon SQS queue policies manage queue access. DynamoDB encrypts data at rest using keys managed by AWS.

EventBridge automatically retries failed event deliveries and sends unprocessed events to a dead-letter queue. Lambda functions can be configured to send failed events to an Amazon SQS dead-letter queue for further analysis and processing. This fault tolerance and error handling ensure reliable event processing and prevent data loss.

The event-driven microservices architecture, built with serverless services like Lambda , Amazon SQS , and EventBridge , automatically scales based on demand, ensuring optimal resource utilization. Furthermore, DynamoDB allows for decoupled storage, scaling throughput and capacity independently to meet performance requirements.

This Guidance optimizes costs through the effective use of AWS services that follow a pay-as-you-go pricing model, charging only for the resources consumed during event processing. For example, the serverless nature of Lambda enables right-sizing compute resources to match workload demands, preventing over-provisioning. Amazon SQS and Amazon SNS minimize data transfer costs by efficiently routing and delivering events. DynamoDB offers cost-effective storage and granular capacity provisioning, allowing independent scaling of throughput and storage based on requirements.

EventBridge , Lambda , API Gateway , Amazon SQS , and Amazon SNS contribute to sustainability by minimizing inactive resource usage. These serverless services are active only when processing events, reducing energy consumption and your infrastructure footprint. The event-driven microservices architecture with Lambda further optimizes resource utilization by running only the necessary code, minimizing the overall environmental impact.