Worked on enhancing intrinsic functions for subword types and byte reversal across multiple Corretto repositories, including corretto-21, corretto-17, corretto-11, and corretto-8. Focused on low-level programming and compiler design, the work involved implementing AArch64-specific optimizations in Assembly and C++ to improve runtime performance and ensure compliance with JVM specifications. Coordinated backporting and code reviews to maintain consistent API behavior across releases, reducing production risk and establishing a foundation for future vectorization. These enhancements improved performance baselines and correctness for intrinsic functions, particularly on 64-bit ARM platforms, and aligned implementation details across all supported Corretto versions.