During June 2025, J. Cunliffe focused on improving the reliability of unit tests in the apache/causeway repository by addressing locale-dependent decimal formatting issues. He identified that inconsistent results in String.format calls were causing test flakiness across different environments. By explicitly enforcing Locale.US in these formatting operations, he ensured that decimal outputs remained consistent regardless of system locale, thereby stabilizing test outcomes and reducing brittle failures in continuous integration. This targeted fix, implemented in Java and leveraging skills in internationalization and unit testing, enhanced the maintainability of the codebase and accelerated feedback cycles for the development team.