Arthur Seche delivered a cross-page Google Tag Manager integration for the ArthurSeche/eleve3 repository, enabling comprehensive analytics and marketing campaign tracking across six key HTML pages. He implemented the GTM script in the head and a noscript fallback in the body, ensuring robust data capture regardless of user settings. Using HTML and JavaScript, Arthur maintained a clean, descriptive Git history with targeted commits for each page, supporting clear traceability and minimal regressions. This work established a reliable foundation for advanced event tracking, improved visibility into user behavior, and empowered both product and marketing teams to make more data-driven decisions.