Worked on the PolicyEngine/policyengine-us repository to deliver a County FIPS Lookup Enhancement, refactoring the existing lookup process to use a merge-based approach. This technical change improved both the accuracy and efficiency of retrieving county names from FIPS codes, directly supporting faster and more reliable policy evaluation workflows. Leveraging Python and the Pandas library, the developer focused on robust data analysis and manipulation techniques to align with the repository’s data handling standards. The enhancement reduced lookup errors and established a scalable foundation for future geographic data management, contributing to maintainable and efficient data workflows within the PolicyEngine-US project.