Kyulee worked on the espressif/llvm-project repository, focusing on improving the reliability of global function merging in the LLVM codebase. Addressing a subtle miscompilation risk, Kyulee implemented a safety guard in the canParameterizeCallOperand logic using C++ and LLVM IR, ensuring that function merging is bypassed when attached call targets cannot be parameterized. This targeted fix prevents incorrect code generation and reduces downstream debugging effort for Espressif toolchains. To ensure long-term stability, Kyulee also developed dedicated automated tests that verify the new behavior. The work demonstrates a deep understanding of compiler development and robust code generation practices.