During October 2025, Guilherme contributed to the glanceapp/community-widgets repository by developing a Steam Top Sellers widget that displays real-time sales data for top-selling games. He focused on frontend development using HTML and CSS, emphasizing both UI design and accessibility. Guilherme refactored the widget’s HTML structure to improve readability and ensure compatibility with screen readers, addressing markup malformations to enhance code quality. He also improved the project’s documentation by reformatting the README in Markdown, making onboarding and usage clearer for new contributors. His work demonstrated a methodical approach to widget development, prioritizing maintainable code and accessible user experiences throughout the process.