Worked on enhancing diagram customization in the mermaid-js/mermaid-cli repository by implementing support for external icon packs, enabling users to load and specify icon sets such as logos and mdi directly from the command line. This involved extending the CLI interface, updating rendering logic, and maintaining comprehensive test assets to ensure consistent output across icon packs. Additionally, contributed to the huggingface/lerobot repository by improving documentation for Phone Teleoperation, clarifying usage instructions and directory structure to streamline developer onboarding. The work demonstrated proficiency in JavaScript, Node.js, and technical writing, with a focus on code quality and developer experience.