An Amazon CloudFront developer designs, implements, and manages the delivery of content through Amazon's content delivery network (CDN). They optimize the system to ensure fast, secure, and reliable distribution of data to users globally. Their tasks include setting up distribution settings, managing caching policies, integrating CloudFront with other AWS services (like , ), and troubleshooting issues. They also use CloudFront's features to protect the application from DDoS attacks, and customize content delivery based on factors like geography or device type. They monitor performance and costs, and make adjustments to improve efficiency and reduce expenses.