Over a two-month period, this developer enhanced the hmrc/cds-reimbursement-claim-frontend and hmrc/customs-declare-exports-frontend repositories by delivering localization improvements, UI messaging clarity, and dependency modernization. They improved Welsh and English messaging, streamlined localization files, and upgraded frontend dependencies and the SASS compiler plugin to support maintainability and future upgrades. Using Scala, SASS, and the Play Framework, they addressed compatibility issues through controlled dependency rollbacks and ensured cross-repository consistency in internationalization. Their work resulted in clearer user communications, leaner localization assets, and a more stable release cycle, supporting safer deployments and faster iterations for Scala/Play-based frontend services.