Takuya Kiriyama focused on improving test reliability and cross-platform determinism in Java-based CI environments. Working on the corretto/corretto-21 repository, he addressed encoding issues in NewLineTest by ensuring the test dynamically detected and used the native character encoding, which reduced flakiness on Japanese Windows systems. In the SAP/SapMachine repository, he stabilized 32-bit JVM test runs by enforcing a 256MB heap limit in the TestMemoryOptions suite, mitigating heap-related failures and ensuring consistent behavior across architectures. His work demonstrated proficiency in Java development, build tools, and testing, delivering targeted bug fixes that enhanced CI stability and code quality.