During March 2025, Lea integrated Google Tag Manager across six key pages in the ArthurSeche/eleve5 repository to enable comprehensive analytics and user interaction tracking. Focusing on analytics instrumentation rather than bug fixes, she updated HTML templates and JavaScript to support event tracking and marketing data collection. Her approach emphasized maintainability and traceability, with clear commit history across all affected files. By enhancing data collection capabilities, Lea enabled more informed measurement of user journeys and marketing effectiveness. The work demonstrated depth in analytics integration and web development, leveraging her skills in HTML, JavaScript, and Google Tag Manager to improve site instrumentation.