Worked on the incubateur-ademe/nosgestesclimat-site-nextjs repository to improve the user settings workflow by addressing a bug that previously prevented users from updating their email addresses. Focused on refining the mutation-based API by removing unnecessary newsletter-related parameters, which resolved the blocker and allowed seamless email updates directly from the settings page. Utilized React and Next.js for front end development, with TypeScript as the primary language. Emphasized code hygiene through clear commit messaging and collaborative development practices. This targeted fix enhanced user experience, reduced potential support requests, and improved data integrity, demonstrating a methodical approach to maintaining and stabilizing production systems.