Kato worked on the EspressoSystems/espresso-sequencer repository, focusing on standardizing the organization of audit report directories. They implemented a feature that renamed the 'Audits' directory to 'audits' and updated PDF file names within both 'external-reviews' and 'internal-reviews' to ensure consistency across the project. Using Git for version control and shell scripting for file operations, Kato’s changes improved the discoverability and accessibility of audit documentation for both internal and external auditors. The work addressed a specific organizational need, reducing manual overhead and supporting clearer audit trails, though it was limited in scope to directory and file structure improvements.