Worked on enhancing the maintainability of the apache/seatunnel project by delivering comprehensive documentation for the CheckpointCoordinator class. Focused on clarifying the lifecycle phases and method responsibilities within the checkpointing subsystem, the work involved writing detailed Javadoc that aligns with Java and open-source documentation standards. This documentation enables faster onboarding for new contributors and provides clearer guidance for future development, reducing the risk of errors in checkpoint management. Collaborated with a co-author to ensure accuracy and completeness, leveraging skills in Java, documentation, and software development to lay a solid foundation for safer and more reliable checkpoint-related changes going forward.