Laurent Garnier enhanced the Measurement API in the powsybl-core repository by introducing a combined setter method, setValueAndValidity, which allows both value and validity to be updated in a single operation. This Java-based backend development streamlined the API’s ergonomics and improved consistency across all Measurement implementations. Laurent applied rigorous unit testing, covering both standard and edge cases such as NaN handling, to ensure the robustness and reliability of the new functionality. By standardizing this approach throughout the codebase, Laurent laid the groundwork for future API simplifications, demonstrating strong skills in API design, backend development, and automated testing practices.