Worked on maintenance and compatibility improvements across espressif/llvm-project and InfiniTensor/InfiniTensor, focusing on code refactoring and build system reliability. In espressif/llvm-project, deprecated code was removed and optimization passes were updated to align with upstream LLVM changes, ensuring continued compatibility and reducing technical debt. For InfiniTensor/InfiniTensor, addressed build failures on GCC 13 and newer toolchains by updating CMake configurations and standard library headers, which improved CI reliability and portability. The work involved C++, CMake, and LLVM IR, emphasizing careful code maintenance, compiler optimization, and proactive handling of compiler warnings to support ongoing project stability and ease of onboarding.