Developed a feature-rich upgrade for the matsim-libs repository by enhancing DRT accessibility modeling with a new estimator and dashboard. The work integrated the DRT Estimator into accessibility calculations, enabling travel distance-based estimates and more accurate scoring. A dashboard was introduced to provide stop-based calculations and support for multiple activity types, improving the granularity of accessibility analysis. Comprehensive tests and configuration updates were implemented to validate the new features, while targeted codebase hardening improved reliability and maintainability. This contribution leveraged Java, algorithm design, and full stack development skills to strengthen data-driven planning capabilities for MATSim deployments across various transportation modes.