Worked on optimizing S3 lifecycle policies within the awslabs/cid-framework repository to address storage cost reduction. Updated AWS CloudFormation templates using YAML to enforce automated expiration of S3 objects and noncurrent versions, setting NoncurrentVersionExpirationInDays to 1 and ExpirationInDays to 7. This approach ensured that outdated data is efficiently removed, directly supporting cost optimization goals and improving data lifecycle management. The work was closely aligned with existing issues and commits for traceability, contributing to the maintainability and automation of infrastructure as code. No bugs were fixed during this period, with the focus remaining on feature delivery and policy refinement.