Roman Ratmansky focused on improving the maintainability of Java build systems in the facebook/buck2 and facebook/buck2-prelude repositories. He addressed technical debt by reverting prior changes that had introduced unnecessary complexity to classpath handling, specifically removing the classpath_targets output and consolidating classpath information. Using Starlark and his expertise in build systems and Java build tools, Roman simplified the logic for Java rule execution, reducing the maintenance surface area and risk of future errors. His work ensured consistent classpath management across both repositories, resulting in clearer, more reliable build processes and strengthening the long-term stability of the Java build infrastructure.