Worked on the google/xls repository to enhance build stability and code generation reliability. Focused on aligning LLVM integration with the latest codebase, which improved both performance and compatibility across build systems using Bazel and C++. Enhanced the type system by refining type inference diagnostics, resulting in clearer error messages for built-in function invocations. Addressed code generation correctness by adding checks for identity extension in zero- and sign-extension paths, preventing invalid literals. Developed a regression test to guard against a previously identified XLS fuzzer crash, ensuring ongoing robustness. Leveraged skills in compiler design, error handling, and Python throughout the process.