Worked on the eksctl-io/eksctl repository to address a critical bug in addon version resolution, focusing on backend development and testing using Go. Implemented an exact-match verification step to prevent partial matches from incorrectly resolving versions with multi-digit suffixes, such as distinguishing between v1.7.7-eksbuild.2 and v1.7.7-eksbuild.20. Enhanced the reliability of addon upgrades by introducing targeted unit tests that cover these edge cases, thereby reducing the risk of unintended deployments across clusters. This work improved version management practices within the codebase and contributed to a more stable and predictable addon upgrade workflow for users.