Developed and delivered a property tax exemption feature for the govpf/openfisca-pf repository, focusing on aligning system terminology and logic with updated business policy. The work involved replacing all instances of 'exoneration' with 'exemption' across Python and YAML configuration files, as well as updating associated tests to ensure consistency and compliance. By implementing permanent property tax exemption rules, the changes addressed evolving policy requirements while maintaining robust regression protection through disciplined testing. This effort demonstrated strong backend development and configuration management skills, with careful attention to policy alignment and collaboration with stakeholders to ensure the system accurately reflected new taxation standards.