A Beanstalk developer utilizes AWS Elastic Beanstalk, a Platform as a Service (PaaS) tool, to deploy, manage, and scale web applications and services. They handle development languages like Java, .NET, PHP, Node.js, Python, Ruby, Go, and Docker. The developer is responsible for application health monitoring, capacity provisioning, load balancing, and automatic scaling. They focus on coding and enhancing applications while AWS services manage the infrastructure. Their tasks also involve troubleshooting, updates, and maintaining the environment. Additionally, they ensure the application's compatibility with the AWS environment and optimize performance.