Worked on improving code quality and reliability in the uxlfoundation/oneDNN repository, focusing on the AArch64 CPU JIT convolution code. Addressed a clang-tidy warning by replacing NULL with nullptr, aligning the codebase with modern C++ standards and reducing the risk of null pointer issues. The update was carefully localized to the JIT convolution path, minimizing the potential for regressions elsewhere in the project. This targeted bug fix enhanced CI stability and maintainability without affecting performance. The work leveraged expertise in ARM architecture, C++, and JIT compilation, demonstrating a methodical approach to code modernization and technical debt reduction.