Worked on the espressif/llvm-project repository to deliver a C/C++ language extension introducing the __nullptr keyword across all language modes. This addition aliased nullptr, enabling consistent type compatibility and reducing platform-specific discrepancies in codebases and tooling. The implementation involved defining new token kinds for proper parsing, updating documentation to reflect the change, and creating comprehensive tests to verify behavior and compatibility. The work demonstrated skills in compiler development, language design, and documentation, with a focus on C and C++. No major bugs were addressed during this period, as the primary effort centered on feature development and cross-repository collaboration.