Igor Santateresa developed a mobile-optimized signing enhancement for the SignPDF feature in the LibreSign/libresign repository, focusing on improving the mobile signer workflow. He implemented a new Sign button within the SignPDF view, enabling users to initiate signing actions more intuitively on mobile devices. To streamline UI state management, Igor introduced a toggleSidebar function at the store level, allowing consistent sidebar visibility control across components. His work leveraged JavaScript and Vue.js, with an emphasis on front-end development and mobile responsiveness. This feature laid the groundwork for broader mobile user experience improvements, though the scope was limited to a single feature during the period.