Andreas Karlsson focused on improving codebase hygiene and dependency management in the spotify/confidence-sdk-java repository. He delivered a targeted refactoring effort, removing generated Google types from the confidence-proto module and consolidating duplicate exception classes to streamline maintenance. By adjusting the Java package structure for shaded types and refining the .gitignore to exclude generated files, Andreas reduced build noise and clarified module boundaries. His work, primarily using Java and Protocol Buffers, established a cleaner foundation for future development and simplified onboarding for new contributors. The depth of his changes addressed long-term maintainability, though the scope was limited to foundational improvements over new features.