Amandus Butzer contributed to the GIScience/openrouteservice repository by building and refining features focused on API reliability, documentation usability, and internationalization. He enhanced API documentation tooling using VitePress and JavaScript, aligning docs with live endpoints and improving version navigation for developers. Amandus addressed backend reliability by fixing dynamic weight computation in Java, ensuring correct handling of hazmat profile parameters for safer routing. He expanded accessibility by adding Ukrainian language support, demonstrating proficiency in internationalization workflows. His work also included CI/CD improvements with GitHub Actions and dependency management, reflecting a methodical approach to maintainability, security, and developer experience across the codebase.