The AWS Organizations Java SDK interacts with the API to access cloud services. To learn more, visit https://github.com/aws/aws-sdk-java/tree/master/aws-java-sdk-organizations/src/main/java/com/amazonaws/services/organizations
Well over 600,000 developers participate in a topcoder community that not only allows them to expand their development skills, but also gives them access to projects where they can get paid for participating.
This tutorial from the FINRA Technology website explains how even novice developers can create a basic REST service for evaluating whether a number is a prime or not. The service is built using automated computing service AWS Lambda, as well as AWS API Gateway and IAM for authentication.