Christoph Borowski modernized the operaton/operaton Java codebase by refactoring legacy instanceof checks and casts to use Java’s newer instanceof with assignment syntax. This targeted update, implemented across core modules, reduced boilerplate and improved code readability while preserving all existing behavior as verified by tests. By aligning the code with current Java standards, Christoph enhanced maintainability and set the groundwork for future pattern-matching features. The work focused on Java development and refactoring, with careful attention to code quality and onboarding ease for new engineers. No bugs were addressed during this period, as the primary focus remained on structural code improvements.