Worked on improving test reliability and cross-platform consistency in Java projects, focusing on the corretto/corretto-21 and SAP/SapMachine repositories. Addressed encoding-dependent failures in NewLineTest by updating the test to detect and use the native character encoding, which reduced flakiness in Windows Japanese environments and improved CI stability. In SAP/SapMachine, enforced a 256MB maximum heap limit for 32-bit test runs within the TestMemoryOptions suite, ensuring deterministic JVM behavior and reducing test failures. Utilized Java, build tools, and testing frameworks to deliver targeted bug fixes, demonstrating attention to cross-architecture compatibility and contributing to more robust automated build pipelines.