An Amazon Web Services (AWS) SDK developer creates, manages, and integrates applications using Amazon's vast array of cloud computing services. They use the AWS SDK, a collection of software tools and libraries, to simplify the coding process for AWS applications. Their responsibilities include writing code to automate cloud-based activities, configuring AWS services to meet specific needs, managing and optimizing AWS resources, and ensuring data security and compliance. They also troubleshoot issues and provide technical support. Their goal is to leverage AWS technologies to create scalable, efficient, and flexible cloud solutions.