Worked on enhancing the Measurement API within the powsybl-core repository by introducing a combined setter method, setValueAndValidity, to streamline the process of updating both value and validity in a single operation. This Java-based backend development effort focused on improving API ergonomics and consistency across all Measurement implementations. Comprehensive unit testing was employed to ensure robustness, covering both standard and edge cases such as handling NaN values with validity. The work established a more reliable and maintainable foundation for future API simplifications, reflecting a methodical approach to API design and a commitment to code quality and developer productivity.