Worked on the aws/aws-sam-cli repository to deliver targeted performance improvements for the package command, focusing on reducing packaging time and optimizing CI workflows. Introduced an experimentalPackagePerformance flag that activates a cache within the Template class and leverages it in resource exporters, enabling more efficient artifact handling. Updated the upload_local_artifacts function to reuse previously uploaded artifacts, minimizing redundant uploads and further accelerating the packaging process. These enhancements aligned with the broader build optimization strategy, contributing to faster end-to-end CI runs. The work was implemented using Python and involved deep familiarity with AWS SAM CLI, CloudFormation, and performance optimization techniques.