Developed and integrated Fcitx5 input method support with Catppuccin theming into NixOS configurations, focusing on enhancing multilingual user experience and visual consistency. The work, contributed to the catppuccin/nix repository, involved creating a dedicated NixOS module for Fcitx5 theming and ensuring seamless integration with existing configuration options. Leveraging skills in Nix, NixOS configuration, and system administration, the developer updated the test suite to validate compatibility with stable NixOS options, reducing configuration fragility. This feature broadened Catppuccin’s reach within the Nix ecosystem and demonstrated a methodical, test-driven approach to module development and repository maintenance over the project period.