Serim worked on the ghostty-org/ghostty repository, focusing on improving UTF-8 text input reliability in the Kitty terminal emulator. During this period, Serim addressed a bug where backspace was incorrectly encoded when UTF-8 text was present. By adjusting the input handling logic in Zig, Serim ensured that Enter and Backspace keys were treated differently depending on the presence of UTF-8 text, preventing backspace from being encoded and reducing input errors. This targeted fix enhanced the overall typing experience in Kitty, demonstrating a solid understanding of terminal emulation and input processing, with careful validation under various UTF-8 scenarios.