Marie-Laure Bardonnet, an intern from Lyon, France, built a significant portion of the Notebooks feature in the Datadog web application, which allows users to save graphs along with text and other information. The feature was developed over seven months, starting with small bug fixes, and gradually becoming more complex tasks. Marie-Laure's experience on this project not only helped her develop new skills but also provided her with mentorship from Ivan DiLernia, the team lead, who encouraged her to take ownership of the project. The success of the feature has led to Marie-Laure returning to Datadog after completing her studies and accepting a full-time position at the company.