Worked on the ArthurSeche/eleve6 repository to implement Google Tag Manager integration across five key HTML pages, enabling comprehensive analytics tracking and marketing campaign monitoring. The approach involved updating each page with the GTM script as well as noscript and iframe fallbacks to ensure data collection even when JavaScript is disabled. All changes were managed through disciplined, per-page commits, providing clear traceability and facilitating reproducibility or rollback if needed. This work established a reliable foundation for cross-page analytics, supporting data-driven decision-making and campaign optimization. Utilized skills in web development, analytics integration, and proficiency with HTML and JavaScript throughout the process.