Worked on the aws/karpenter-provider-aws repository to enhance the reliability and portability of shell scripts used in production environments. Focused on refactoring get-controller-policy.sh for POSIX compliance, the developer improved temporary file handling to prevent leaks and rewrote sed operations for greater readability and cross-platform compatibility. This update addressed a key bug, aligning the script with best practices for safe and portable automation. Utilizing shell scripting and deep knowledge of POSIX standards, the work laid a foundation for future enhancements, ensuring that tooling remains robust and maintainable across diverse deployment scenarios without introducing new features during the period.