Worked on enhancing data integrity within the aws-powertools/powertools-lambda-typescript repository by addressing a subtle but impactful bug in the deepMerge utility. Focused on ensuring that existing values were not overwritten with undefined during data merges, the solution improved reliability for Lambda utilities and downstream consumers. Collaborated with other contributors to deliver a targeted fix that minimized changes to the codebase while maximizing maintainability. Utilized TypeScript and full stack development skills to implement and validate the update, resulting in more predictable merge behavior for users relying on these utilities in serverless environments. The work emphasized careful, detail-oriented engineering.