An ecommerce company runs a transaction processing system within a large application on a set...

Decouple the transaction system into microservices that run on AWS Lambda functions. Expose the microservices through a central Amazon API Gateway REST API. Use Amazon SQS queues to decouple order creation and payment processing.

Migrate the transaction system to an Amazon EKS cluster. Deploy the Kubernetes Vertical Pod Autoscaler to manage application scalability.

Add caching layers to the transaction system by using an Amazon ElastiCache cluster. Scale the EC2 instances to the largest size available to handle the increased load.

Decouple the transaction system into microservices. Deploy each microservice as a separate application to its own dedicated group of EC2 instances. Place each group of instances behind a separate ALB. Scale the application by launching larger EC2 instance sizes as needed.