Berk Buyukyildiz updated the childcare allowance rates for 2025 and 2026 in the hmrc/childcare-calculator-frontend repository, focusing on configuration management to ensure the calculator reflects current policy. He introduced new rate structures within the configuration, enabling accurate calculations across all relevant age and job groups. This work involved policy data modeling in the frontend and traceable, well-documented commits for accountability. Although no major bugs were addressed during this period, Berk’s contribution improved calculation accuracy and policy compliance. The update reduced the risk of outdated rates, enhancing reliability for end users and supporting maintainability through configuration-driven rate management.