Worked on the Ghostty repository to enhance the reliability of font rendering by addressing a bug in the font codepoint mapping logic. Focused on improving correctness and stability, the developer reworked the CodepointMap.get traversal to ensure deterministic mapping, prioritizing the latest matching codepoint range. This targeted fix reduced misassignment of font codepoints and improved typography consistency across projects. The approach emphasized minimal-risk changes and incorporated unit testing to validate the new logic and prevent regressions. Utilizing Zig programming and font rendering expertise, the work lowered support overhead and contributed to a more robust and maintainable codebase for future development.